Answer:
Explanation:
a damming a river increases the supply. Supply side solution. There's more water there.
b desalinating seawater definitely increasing the supply. You create drinking water from what was not there before.
c invading nation for rivers increasing the supply (not by much. The people who are there still need their water).
d Raising water prices reducing the demand
e Tax breaks reducing (and maintaining) the demand
f drip irrigation reducing the demand.
Answer:
Supply-side solutions: desalinating seawater , damming a river to create a reservoir , a nation invading a neighboring country to access their rivers Demand-side solutions: raising water prices for consumers and businesses , providing tax breaks for companies that use less water , requiring low-flow shower heads in al new homes , replacing inefficient irrigation with more-efficient drip irrigation to grow cropsExplanation:
As stated in the above question, supply side solutions increase the supply of fresh water. This means that the options that will increase the level of fresh water that will be offered to the consumer will be on the supply side, that is, those options that will provide plenty of choice for the consumer should be on the supply side, so we can say that the solutions are: desalinating seawater, damming a river to create a reservoir, a nation invading a neighboring country to access their rivers
The above question also states that demand-side solutions will reduce demand for fresh water. This means that these solutions should discourage consumers from paying for or limiting their use of fresh water. These solutions are: raising water prices for consumers and businesses, providing tax breaks for companies that use less water, requiring low-flow shower heads in new homes, replacing inefficient irrigation with more-efficient drip irrigation to grow crops
Researchers want to know how overfishing is impacting fish populations to make decisions about whether new policies are needed to protect fish populations. What empirical evidence could be collected to get an idea of how overfishing is affecting particular populations?
Scientists could measure the amount of bycatch.
Scientists could measure the amount of money collected by fishermen.
Scientists could measure the level of animal waste in the water.
Scientists could measure the number of fishermen on the water.
Answer:
A. scientists could measure the amount of bycatch
Explanation:
Answer: Scientists could measure the amount of by catch.
Explanation:
Overfishing is the process of fishing in which a considerable number of fish species are removed from the water body at a rate that the population of such species cannot be replenished for a long period of time. This results in the decline in the population of the fish species, or extinction of the species. This can lead to the loss of biodiversity.
If the researchers wants to the impact of the overfishing they could measure the amount of by-catch. As the by-catch over the expected or standard limits can lead to the decrease in the fish population belonging to a particular species. This may lead to the extinction of many fish species.
The client brings the results of recent cholesterol screening with him to see the nurse. The client is confused about what the results mean and asks what the total cholesterol number should be. Which of the following statements could the nurse make about interpreting the results of the cholesterol screening test?
a.Total blood cholesterol should not exceed 150 mg/dl
b.Total cholesterol should not exceed 200 mg/dl
c.Total cholesterol should not exceed 150 mg/ml
d.Total cholesterol should not exceed 200 mg/ml
Answer:
B
Explanation:
what kind of organism developed first
Answer:
Sponges
Explanation:
A.p.e.x
The first organisms that developed on Earth were most likely simple, single-celled microorganisms. These early life forms emerged around 3.5 to 4 billion years ago during the Precambrian era.
They were likely prokaryotic organisms, lacking a nucleus and membrane-bound organelles. These early life forms were adapted to the harsh conditions of the ancient Earth, where there was no oxygen-rich atmosphere and the environment was dominated by volcanic activity.
Over time, through natural processes of evolution and natural selection, more complex and diverse life forms evolved. The first eukaryotic cells, which have a defined nucleus and membrane-bound organelles, appeared around 1.6 billion years ago. Multicellular organisms, such as simple algae and protozoans, emerged around 1 billion years ago.
The process of evolution has led to the development of a wide variety of organisms, culminating in the diverse array of life forms that exist on Earth today.
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The manubrium, body, and xiphoid process form a bone called the __________.
The manubrium, body, and xiphoid process form a bone called the sternum.
What is a monosynaptic reflex arc?
Answer:
A reflex arc with single synapse (integrating center) is a monosynaptic reflex arc.
Explanation:
A reflex arc consists of sensory neurons, motor neurons, integrating center, sensory receptors, and effectors.
A monosynaptic reflex arc is the one that consists of only a single synapse in the central nervous system. This means that the whole monosynaptic reflex arc has only one synapse between single sensory and motor neurons.
What is systolic and diastolic blood pressure
Answer:
The diastolic blood pressure (80 mmHG) is the pressure in artery measured during the diastolic phase while the systolic blood pressure (120 mmHg) is the one measured during systolic phase of cardiac cycle.
Explanation:
The diastolic blood pressure is the pressure in the artery during the diastolic phase of the cardiac cycle, that is, when the left ventricle undergoes relaxation. It is 80 mmHg for a normal adult.
And the systolic blood pressure is the blood pressure in an artery during the systolic phase of the cardiac cycle, that is, when the left ventricle undergoes contraction. It is 120 mmHg for a normal adult.
A typical human cell is approximately 12.00 μm in diameter and enclosed by a membrane that is 5.000 nm thick. (a) What is the volume of the cell including the membrane? (b) What is the volume of the cell membrane? (c) What percent of the total volume does its membrane occupy? To simplify the calculations, model the cell as a sphere. Enter your answers using four significant figures.
To calculate the volumes related to a spherical human cell, we use the volume formula for a sphere. The total volume of the cell is computed as well as the volume of the membrane, then we determine the percentage of the total cell volume that the membrane occupies, which is about 0.0624%.
Explanation:To calculate the various volumes requested in these questions regarding a typical human cell modeled as a sphere, we start by computing the volume of the entire cell including its membrane. The formula for the volume of a sphere is V = (4/3)\u03c0r^3.
To find the volume of the cell, including the membrane, with a diameter of 12.00 \u03bcm, we first determine the radius, which is half the diameter, so 6.00 \u03bcm or 6.00 x 10^-6 m. Substituting this into the formula gives us approximately 904.78 x 10^-18 m^3.
For the volume of the cell membrane, we must consider the volume of the cell with the membrane and subtract the volume of the cell without the membrane. The thickness of the membrane is 5.000 nm, or 5.000 x 10^-9 m. The outer radius of the cell is 6.00 \u03bcm, and the inner radius, after subtracting the thickness of the membrane, is 5.995 \u03bcm or 5.995 x 10^-6 m. The volume of the cell membrane is then the volume of the sphere with a 6.00 x 10^-6 m radius minus the volume of the sphere with a 5.995 x 10^-6 m radius, which comes out to approximately 0.565 x 10^-18 m^3.
Lastly, to find the percent of the total volume that the membrane occupies, we divide the membrane volume by the total cell volume and multiply by 100%, resulting in approximately 0.0624%.
Dorchester Company had the following balances at the end of 2018 and 2019 respectively: Net Credit Sales - $955,000 for 2018 and $1,022,000 for 2019. Accounts Receivable - $88,000 for 2018 and $111,000 for 2019. Allowance for Doubtful Accounts - $4,000 for 2018 and 5,500 for 2019 Calculate the accounts receivable turnover ratio to one decimal place.
Answer:
The turnover ratio is 10.7
Explanation:
Turnover ratio may be defined as the ration of net credit sales with the average accounts receivable.
The formula used to calculate the turnover ratio is :
[tex]\text{Turn over ratio}= \frac{\text{net credit sales}}{\text{average account receivables}}[/tex]
Net credit sales (2019)= $1,022,000
Average account receivables = [tex]\frac{(88,000-4000)+(111,000-5,500)}{2}[/tex]
=94750.
[tex]\text{Turn over ratio}=[tex]\frac{1,022,000}{94750}[/tex]
= 10.7
Hence, The turn over ratio is 10.7.
Describe how and where tropical systems form, and what makes a tropical system a hurricane. Then explain the anatomy of a hurricane, and what factors control both strengthening and weakening. Describe the various impacts of a hurricane and how they can result in damage or deaths with respect to location. Finally, what can people do to best protect themselves from injury or loss of life in the event of a hurricane?
Which of the following is not a part of DNA extraction?
a. Separate DNA from protein and debris
b. Isolate concentrated DNA
c. Collect cheek cells
d. Add enzymes to make the DNA "sticky"
e. Burst cells open
Answer:
D
Explanation:
Extracting DNA involves firstly harvesting the required cells (such as from the inside of cheeks), then the cells are broken up using enzymes or detergents. The products (usually a mixture of cell products –mainly RNA, DNA, and proteins) are then put in a centrifuge to separate the proteins from the DNA.
Which of the following might be symptoms of a lesion to the right motor cortex?
a) loss of movement of the left leg
b) loss of movement of the right leg
c) loss of movement of the head and trunk
d) complete loss of bladder control
Answer:
loss of movement of the left leg
Explanation:
The main function of the brain motor cortex is the regulation of body movements. This area of brain controls the voluntary movements of the body.
Right half of the body controls the left side of body and left half of the body controls the right side o body. Any lesion in right motor cortex may cause the loss of movement of left leg.
Thus, the correct answer is option (A).
Muscle that compresses the abdomen
a. Transverse abdominis
b. Rectus abdominis
Answer:
The answer is B. Rectus abdominis
Hope this helps!
Answer:
the answer is b!
Explanation:
Which of the following is not true for antibodies?
a. they are proteins
b. they are produced in response to the presence of an antigen
c. they are capable of interacting with several antigens
d. they are abbreviated as lg
e. they are present in blood and body secretions
Answer:
c. they are capable of interacting with several antigens
Explanation:
Antibodies, also called immunoglobulins (Ig), are protein structures found in blood plasma. They act against invading organisms in the body, such as bacteria and viruses. The main function of antibodies is the body's defense, which act directly against invading microorganisms (also called antigens) that can cause various infections and diseases. In this way they neutralize the toxins of extracellular parasites.
Antibodies are produced by B lymphocytes and have the ability to specifically combine with substances foreign to the body, inactivating them. Antigens are extremely specific, so we can say that for each of their types there is a type of antibody, complementary to that of the antigen. Thus, antibodies are not able to interact with various antigens, but only those with which they establish a specific relationship.
The statement that is not true about antibodies is d. they are abbreviated as lg
Which is not true for antibodies?The statement "they are abbreviated as lg" is not accurate when referring to antibodies. Antibodies are commonly abbreviated as Ig, which stands for Immunoglobulin. Immunoglobulins are a vital class of proteins produced by the immune system in response to the presence of antigens, which are foreign substances like bacteria, viruses, or other pathogens.
When the immune system detects an antigen, it triggers the production of specific antibodies designed to target and neutralize that particular antigen. The structure of antibodies allows them to bind specifically to antigens, effectively marking them for destruction by other immune cells or neutralizing their harmful effects.
The ability of antibodies to recognize and bind to various antigens makes them a crucial defense mechanism in the immune system. They help prevent infections, clear pathogens from the body, and contribute to the development of immunity after exposure to specific diseases.
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List vertebral column bones in correct order from Cervical to Coccyx.
Answer:
Cervical vertebrae, thoracic vertebrae, lumbar vertebrae, sacrum, coccyx.
Explanation:
Vertebral column or spine is made of a total of 26 vertebrae in adults. Starting from the upper part, it has 7 cervical vertebrae, 12 thoracic vertebrae, 5 lumbar vertebrae, one sacrum, and one coccyx.
The coccyx is made of four fused coccygeal vertebrae. Likewise, the sacrum consists of five sacral vertebrae that are fused during development.
How many lumbar vertebrae are in the vertebral column?
The adult human vertebral column contains five lumbar vertebrae, which are designated as L1-L5 and located in the lower back region.
Explanation:The human vertebral column includes a series of bones known as vertebrae, which are categorized into different regions. Among these regions, the lumbar vertebrae are found in the lower back. According to the provided information, the vertebral column consists of seven cervical vertebrae (C1-C7), twelve thoracic vertebrae (T1-T12), and five lumbar vertebrae (L1-L5). The lumbar vertebrae are especially crucial as they endure the stress of lifting and carrying and provide flexibility and movement to the torso.
The sacrum is formed by the fusion of five sacral vertebrae, while the coccyx or tailbone originates from the fusion of four coccygeal vertebrae. Overall, the adult vertebral column typically consists of 24 individual vertebrae, the sacrum, and the coccyx, with the lumbar section exclusively containing five lumbar vertebrae.
How are BMR and TDEE different?
Answer:
BMR ( Basal metabolic rate)
BMR may be defined as the energy required for the proper functioning of body at rest. This is the amount of energy required from the basal metabolism of the body. BMR is always less than TDEE. BMR of the body remains same in case of weight gain or weight loss.
TDEE ( Total daily energy expenditure)
TDEE may be defined as the daily energy expenditure of the body. The amount of energy requires from the physical activity and basal metabolism of the body. TDEE is always higher than the BMR. TDEE of the body may be affected by the weight gain or weight loss.
BMR represents the energy expended for essential bodily functions at rest, making up about 70% of daily energy use. TDEE, however, includes energy usage for all activities, not just at rest, and therefore is normally higher than BMR.
Explanation:The Basal Metabolic Rate (BMR) and Total Daily Energy Expenditure (TDEE) are two different aspects of metabolism.
The BMR refers to the amount of energy expended by a human at rest in a neutrally temperate environment, largely to maintain the basic functions of the body's organs, accounting for about 70 percent of all daily energy expenditure. As we age, or lose muscle mass, the BMR generally decreases.
On the other hand, the TDEE represents the total amount of energy expended in one day, combining the energy utilized for basic bodily functions (resting metabolic rate, close to BMR), the energy consumed during physical activities, and the energy required for body thermoregulation. Therefore, TDEE would be higher than BMR in active people with more lean body mass.
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Which statement is not correct about the antibodies?
a. They are protein molecules that bind to the specific antigens
b. They are produced by memory B cells
c. They consist of 2 heavy chains and 2 light chains
d. They contain fixed and variable regions
e. They are also called immunoglobulins
Answer:
b. They are produced by memory B cells
Explanation:
The rapid cell division in activated B cells is followed by the differentiation of daughter cells into the plasma cells. The plasma cells are the precursor for antibodies and memory B cells. The antibodies kill the antigens while memory B cells are long-lived cells.
Hence, antibodies are not produced by memory B cells but by plasma cells.
What is the significance of secreting inactive pepsinogen from the mucosal cells instead of pepsin?
Answer:
Pepsin is an enzyme present in the gastric juice which digests the proteins of the food material.
These pepsin are synthesized as pre-proenzymes or inactive forms by chief cells in the gastric mucosa of the stomach. These inactive forms consist of a signal peptide, activation peptide and active enzyme which gets activated in the acidic environment of stomach by Hydrochloric acid.
The stomach secrets this enzyme in an inactive form to prevent the digestion of protective proteins present in the lining of the digestive tract.
What is a cell membrane and describe its structure and components.
Answer:
Cell membrane or plasma membrane is the semi-permeable outer layer surrounding the components of the cell.
It is important to the cell as it provides important properties to the cell as it separates the aqueous interior of the cell from the external environment, helps in cell–cell contact, in surface recognition, signaling and transport.
The plasma membrane is made up of different types of molecules like phospholipids, proteins, cholesterol, carbohydrates providing flexibility to the layer so, the model of membrane is known as fluid mosaic model.
The primary constituent of membrane is a lipid molecule called Phospholipids which is made up of glycerol molecules attached to a phosphate group and forms a hydrophilic head while long fatty acyl chains attached to the head froms hydrophobic tails.
It is the fatty acid chains which provide hydrophobic nature to the cell membrane. These layers are arranged in the form of bilayer with head towards outside while tails inside.
Along with phospholipid membrane posses peripheral and integral proteins which helps in transport of the molecules across membrane.
The metaphyses of a 40-year-old's long bones have?
The metaphyses of a 40-year-old's long bones have appositional growth.
What is metaphyses?
The broad segments of long bones and the areas of the bone where growth takes place are referred to as metaphyses (plural: metaphysis). The metaphysis portion next to the growth plate experiences growth (physis).
Between the diaphysis and epiphysis is the metaphysis. The metaphysis is more vulnerable to osteomyelitis and hematogenous spread of infection in children because of its relatively rich blood supply and increased vascular stasis.
Between the epiphysis and the diaphysis, a long bone's neck is known as the metaphysis. It houses the growth plate, the portion of the bone that develops during childhood. As it expands, the growth plate ossifies close to the diaphysis and the epiphyses.
Therefore, The metaphyses of a 40-year-old's long bones have appositional growth.
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Final answer:
The metaphyses of a 40-year-old's long bones have an epiphyseal line, indicating that the growth plates have closed and the bones can no longer grow in length.
Explanation:
The metaphyses of a 40-year-old's long bones have undergone a process known as epiphyseal plate closure. By the age of 40, the regions of cartilage typically found in the metaphyses during childhood and adolescence, which are responsible for the longitudinal growth of the bones, have been replaced by osseous tissue. This replacement transforms the epiphyseal plate, also referred to as the growth plate, into an epiphyseal line. Therefore, in a 40-year-old individual, the long bones no longer can grow in length, as the cartilage cells have ceased dividing and have been completely substituted with bone, resulting in the fusion of the epiphysis and diaphysis.
Which of the following structures would be considered an accessory organ to the digestive system and NOT part of the alimentary canal?
(a) Pancreas
(b) Esophagus
(c) Stomach
(d) Small Intestine
The structure listed that is not a part of the alimentary canal, yet is an accessory organ to the digestive system is the Pancreas. Option A is correct.
The alimentary canal is also known as the gastrointestinal tract. This includes all organs through which food travels once ingested. Which would be:
MouthPharynxEsophagusStomachSmall intestineLarge intestineSince they are included in this list, options B, C, and D are incorrect given that they do form part of the alimentary canal. The accessory organ is the pancreas given that it secrets substances into this canal that then assist in the digestive process.
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The pancreas is considered an accessory organ to the digestive system.
Explanation:An accessory organ to the digestive system is an organ that helps in the process of digestion but is not part of the alimentary canal. The pancreas is considered an accessory organ because it produces digestive enzymes and releases them into the small intestine to aid in the digestion of carbohydrates, proteins, and fats.
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True or False. Sickle-cell anemia causes anemia due to abnormal shape of RBCs which may cause them to block blood vessels.
Answer:
true
Explanation:
the shape of the rbc are usually sickles or cresent moon shaped. these shapes get stuck in small blood vessels. which can slow or block blood flow
Currently there is no cure for sickle-cell anemia
The distal end of the humerus has
a. epicondyles
b. trochanters
c. tuberosities
d. foramina
Answer: a. epicondyles
Explanation:
Distally the humerus bone is flattened. It exhibit a prominent bony projection on the medial side it is called as the medial epicondyle of the bone. The lateral epicondyle is present on the lateral side of the distal part of the humerus bone.
The grasping and powerful muscles of the forearm are attached with the medial epicondyle. It is typically robust and larger as compared to the lateral epicondyle. The lateral epicondyle is attached with the weaker muscles attached posteriorly.
What determines whether a neuron is unipolar, bipolar, or multipolar? Draw an example of each.
Unipolar Neuron:
The cell body has a single process extending from it, which later branches into two.
Bipolar Neuron:
The cell body has two processes: one axon and one dendrite.
Multipolar Neuron:
The cell body has multiple processes, typically one axon and multiple dendrites.
The classification of neurons as unipolar, bipolar, or multipolar is determined by the number and arrangement of processes extending from the cell body. In a unipolar neuron, there is a single process that emerges from the cell body and later splits into two branches, while a bipolar neuron possesses two processes – one axon and one dendrite – extending from opposite ends of the cell body. On the other hand, multipolar neurons feature multiple processes, usually one axon and several dendrites, emerging from the cell body.
The structural diversity among these neuron types reflects their specialized functions in transmitting and processing information within the nervous system. Unipolar neurons are often involved in sensory functions, bipolar neurons are commonly found in sensory organs like the retina, and multipolar neurons play a key role in motor functions and interneuronal communication within the central nervous system.
The rgion between the tip and the shaft of a long bone is the?
Answer:
Metaphysis
Explanation:
The tip of a long bone is known as epiphysis and the shaft of a long bone is named as diaphysis.
Metaphysis is located between the tip and shaft of a long bone. Metaphysis tissue consists of epiphyseal plate, fibrous and bony component. Metaphysis undergoes ossification near the diaphysis. The metaphysis of long bone of children is more prone to the osteomyelitis condition.
The region of a long bone that articulates with another bone at a joint is the
A) Epiphyseal plate
B) Epiphysis
C) Diaphysis
D) Medullary Cavity
The region of a long bone that articulates with another bone at a joint is the Epiphysis.
The extracellular matrix of bone consists of
The extracellular matrix of bone consists primarily of collagen, providing soft framework and flexibility, and hydroxyapatite, a mineral that lends hardness to bones. These two components allow bones to be both strong and flexible.
Explanation:The extracellular matrix of bone primarily consists of collagen, a protein that provides a soft framework, and hydroxyapatite, a hard mineral made of calcium phosphate. Together, these two components allow the bones to be strong, yet flexible enough to withstand physical stress. While collagen provides tensile strength and flexibility, hydroxyapatite gives bone its hardness and compressive strength. This combination of ingredients in the extracellular matrix enables bones to fulfill their many functions including support, movement, and protection of various body organs.
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The extracellular matrix of bone consists of organic material made of collagen and elastic fibers and inorganic material primarily composed of calcium salts, forming hydroxyapatite. These components together ensure that bones are strong, hard, but not brittle.
Explanation:The extracellular matrix of bone is a mixture of organic and inorganic material. The organic material primarily includes collagen and elastic fibers, which give bone its strength and flexibility. The inorganic material primarily includes mineral salts, specifically hydroxyapatite formed from calcium salts, and contributes to the bone's hardness and strength. Essential cells of the bone, such as osteocytes, are embedded within this matrix, contributing to the unique properties of the bone tissue.
Without collagen, bones would be brittle and shatter easily. Without mineral crystals, bones would flex and provide little support. The extracellular matrix's balance of these components allows bones to be durable while also having some degree of flexibility.
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It is the functional unit of a muscle fiber.
Answer:
The answer to this question is a bit more complex, because there is not one single name for the three types of muscle fibers in the human body. It is important thus to remember that the human system has three types: skeletal muscle, or voluntary muscle, smooth muscle, and cardiac muscle fibers.
In the case of skeletal muscle, the functional unit of myofibrils, the ones responsible for movement, is called a sarcomere, and they are striated. These sarcomeres combine in units of myofibrils that when stimulated by motor neurons, produce movement.
The second case is smooth muscle. In this case, we have single-unit cells, elongated, to form the linings of organs such as the bladder, and their movement is not voluntary. This system´s unit, then, is called a myocytes.
The third type of muscle, which is cardiac muscle, is the one responsible for the movements of organs such as the heart, and their unit is better known as cardiomyocyte.
The functional unit of a muscle fiber is the Sarcomere. It is responsible for muscle contraction and accounts for the striated appearance of skeletal muscles.
Explanation:The functional unit of a muscle fiber is termed as the Sarcomere. The Sarcomere, which is located inside the muscle fiber, is responsible for the muscle's contraction. It is a repeating unit along the length of the muscle fiber and it represents the smallest functional unit within the myofibril. The arrangement of sarcomeres gives skeletal muscles their striated appearance. In simpler terms, the Sarcomere works like a tiny engine within the muscle, driving muscle contraction.
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The alpha and beta receptors are known as _________ receptors and are found at the ________ of the ________ division.
a. Cholinergic/peripheral ganglion/parasympathetic
b. Adrenergic/peripheral ganglion/sympathetic
c. Cholinergic/effector/sympathetic
d. Cholinergic/effector/parasympathetic
e. Adrenergic/effector/sympathetic
Answer:
Adrenergic/effector/sympathetic
Explanation:
The two main divisions of autonomic nervous system are sympathetic nervous system and para sympathetic nervous system. This nervous system controls the involuntary actions of the body.
Adrenergic receptors are included in the G protein coupled receptors. Alpha and beat receptors are adrenergic receptors. These receptors are present on the effector molecule. Alpha and beta receptors are important during fight and flight response and are included in the sympathetic nervous system.
Thus, the correct answer is option (e).
Most vertebrae are found in which region?
a. cervical
b. thoracic
c. lumbar
d. sacral
e. coccyxgeal
Answer: b. thoracic
Explanation:
A vertebral column is also called as backbone in human skeleton. It forms the part of axial skeleton. It includes a verticle series of bones which covers and protects the spinal cord. It includes 33 vertebral bones like 7 cervical, 12 thoracic, 5 lumbar, 5 sacral, and 4 coccygeal bones.
On the basis of this description, thoracic region exhibit most vertebrae.
Answer: b. thoracic
Explanation:
A vertebral column is also called as backbone in human skeleton. It forms the part of axial skeleton. It includes a verticle series of bones which covers and protects the spinal cord. It includes 33 vertebral bones like 7 cervical, 12 thoracic, 5 lumbar, 5 sacral, and 4 coccygeal bones.
On the basis of this description, thoracic region exhibit most vertebrae.