Answer: b. hemolysis
Explanation:
A hypotonic solution is the one where the solute concentration is less than that of the RBCs. Therefore, the solvent will enter inside the RBCs due to osmotic pressure. This will lead to the increase in concentration of the solvent inside the cells this will lead to the swallowing of the cell and with generation of the high internal pressure inside the cell the cell will burst. This will result in hemolysis.
Which type of dwarfism affects only the long bones? They have a normal size, head and torso.
Answer:
Achondroplasia affects the long bones and individual has normal size, head and torso.
Explanation:
Achondroplasia dwarfism may be defined as the form of dwarfism in which the conversion of bone to cartilage is defected. This is the most common form of dwarfism.
Achondroplasia dwarfism mainly affects the long bones of an individual as there is problem in the conversion of cartilage to bone. The individuals have short arms and legs but they have normal head and torso size. The individuals has height around 4 feet.
The actual duplication of generic material in a cell takes place during
a. anaphase
b. metaphase
c. prophase
d. interphase
e. telophase
Answer:
d. interphase
Explanation:
The cell cycle has stages namely the interphase and M phase. Interphase is the stage of preparation for nuclear division, which is M phase. Interphase has three stages: G1, S and G2. The G1 and G2 are the phases of cell growth. The S phase of the cell cycle is also called a "synthetic phase". This is because DNA replication occurs in S phase of the interphase of the cell cycle.
Since DNA is genetic material, actual duplication of genetic material occurs in interphase.
Inhibin is secreted from the _________ and acts to reduce the secretion of _________.
a. hypothalamus; LH
b. Sustentacular cells; FSH
c. Leydig cells; FSH
d. Leydig cells; LH
e. anterior pituitary; FSH
Answer:
b. Sustentacular cells; FSH
Explanation:
Sertoli cells are the sustentacular cells of seminiferous tubules since they serve to give structural support to the germ cells. Likewise, sustentacular cells are also present in ovaries.
The sustentacular cells of testes and ovaries serve to secrete inhibin hormone. The function of inhibin hormone is to inhibit the release of follicular stimulating hormone (FSH) from the anterior pituitary gland.
What is the dominant fiber type of bone tissue?
A) Reticular
B) Collagen
C) Elastic
Answer:
A) Reticular.
The dominant fiber type of bone tissue is collagen, providing strength and resistance to stretching.
Explanation:The dominant fiber type of bone tissue is collagen. Collagen fibers are made from fibrous protein subunits linked together to form a long and straight fiber. These collagen fibers provide bone with its notable tensile strength, giving it the ability to resist stretching and contribute to the tissue's resilience. In bone tissue, the rigid, mineralized matrix that contains calcium salts and crystals is interwoven with collagen fibers, ensuring the bone's strength and stability.
True or False. Osmosis is an active process of the cell.
Answer:
mitochondria its the correct one
Explanation:
In skeletal muscle, the area that is composed only of both thick and thin filaments is the
a. A-Band
b. I-Band
c. H-Zone
d. sarcomere
e. synapse
Answer:
A-Band
Explanation:
Sarcomere is the basic unit of skeletal muscle and shows various striations under the microscope.
Anisotropic band or A-Band is the portion of sarcomere that contains both the thick and thin filaments . A-Band appaers dark under the microscope. Thick filaments are consist of actin and thin filaments consists of myosin.
I-Band contains only thin filaments of myosin. H- zone contains only thick filaments and no thin filament. Sarcomere is the unit of a skeletal muscle. Synapse is the junction between two neurons.
Thus, the correct answer is option (A).
Which of the following activities is most closely associated with NK cells?
Options:
production of antibodies
release of reactive oxygen intermediates
production of IL-6
killing of virus-infected cells
phagocytosis of bacteria
Answer:
killing of virus-infected cells
Explanation:
Natural killer (NK) cells is the major component of immune system and a type of white blood cells that play an important role in immunity. Protease enzyme is present in the NK cells.
Natural killer cells can identify the virus infected cells and activates the cascade mechanism to kill the virus cells. Natural killer cells release cytokines that can kill the virus infected cells.
Thus, the correct answer is option 4.
Which hormone works directly in the intestine to increase plasma calcium levels?
A. parathyroid hormone (PTH)
B. calcitonin
C. calitriol
D. renin
The hormone that works directly in the intestine to increase plasma calcium levels parathyroid hormone (PTH). The correct option is A.
PTH is a hormone generated by the parathyroid glands, which are situated near the thyroid gland in the neck. PTH is essential for calcium regulation in the body.
PTH is released into the circulation by the parathyroid glands when blood calcium levels are low.
PTH increases plasma calcium levels via acting on various target organs, including the intestines, bones, and kidneys.
PTH promotes calcium absorption from dietary sources in the gut. It increases the production of active vitamin D (calcitriol) in the kidneys, which improves calcium absorption in the intestines.
Thus, the correct option is A.
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Learn the reactants and products for each stage of photosynthesis, and where in the plant cell does each stage occur.
Answer:
1: Light-dependent reactions:
Reactants: H2O, ADP, NADP
Products: O2, ATP, NADPH
Location: Thylakoid membranes of chloroplasts in cells of leaves
2: Light-independent reactions
Reactants: CO2, H2O, ATP, NADPH
Products: C6H12O6 (glucose), ADP, NADP
Location: Stroma of chloroplasts in leaf cells
Explanation:
Photosynthesis takes place in two stages:
1: Light-dependent reactions: This stage includes splitting of water in the presence of sunlight and release of electrons and oxygen gas. The electrons are channeled into the electron transport chain and result in the formation of ATP and NADPH. This stage includes photosystem I and II present in the thylakoid membrane. Hence, light-dependent reactions of photosynthesis occur in the thylakoid membrane of chloroplasts and form ATP and NADPH.
2: Light-independent reactions: Also called as Calvin cycle, the light-independent reactions use ATP and NADPH formed during light reactions of photosynthesis to fix CO2 into glucose. The enzymes of the Calvin cycle are present in the stroma of chloroplasts and hence, this stage of photosynthesis occurs in the chloroplast stroma.
What are the ways that mitosis and meiosis are used in the body?
Answer: Mitosis is cell group that transpires in practically all tissues, ending in the growth and restoration of tissues and organs.
Explanation:
Hope this helps
What are the formed elements (cell or parts of cell) in blood and what are their functions ?
Answer:
The formed elements of the blood include red blood cells (erythrocytes), white blood cells (leukocytes), and platelets (thrombocytes). Of these, leukocytes are primarily involved in the immune response. All formed elements originate in the bone marrow as stem cells (HSCs) that differentiate through hematopoiesis.
Explanation:
The formed elements of the blood include red blood cells (erythrocytes), white blood cells (leukocytes), and platelets (thrombocytes). Of these, leukocytes are primarily involved in the immune response. All formed elements originate in the bone marrow as stem cells (HSCs) that differentiate through hematopoiesis.
Final answer:
Blood contains formed elements such as red blood cells, which transport oxygen and carbon dioxide; white blood cells, which defend against infections; and platelets, which are involved in blood clotting and tissue repair.
Explanation:
The Formed Elements of Blood and Their Functions
The formed elements of blood include red blood cells (RBCs or erythrocytes), white blood cells (WBCs or leukocytes), and platelets (thrombocytes). These elements play critical roles in the body's functions and are suspended in the plasma, the extracellular matrix of the blood.
Functions of Red Blood Cells
Red blood cells are biconcave cells that carry hemoglobin, a molecule essential for transporting oxygen from the lungs to the tissues and carbon dioxide from the tissues back to the lungs. They lack a nucleus and mitochondria, which allows for more space to carry hemoglobin. Erythrocytes have a lifespan of about 120 days and are produced in the bone marrow.
Functions of White Blood Cells
White blood cells are key to the body's immune response. They fight infections and foreign bodies through processes like diapedesis, where they pass out of blood vessels into tissues. Leukocytes include granular types such as neutrophils, eosinophils, and basophils, and agranular types such as monocytes, NK cells, B cells, and T cells.
Functions of Platelets
Platelets are small cell fragments that originate from megakaryocytes in the bone marrow. They play a significant role in hemostasis, the process of blood clotting, by forming a temporary plug at a site of injury to the blood vessels. Platelets also release growth factors to repair and heal tissues.
Together, these elements ensure proper oxygenation of tissues, defense against pathogens, and prevention of excessive bleeding.
Which cranial nerve innervates the thyroid gland?
Answer:
Vagus nerve
Explanation:
Vagus nerve is the tenth cranial nerve that can innervate in the neck, thorax and abdomen.
Thyroid gland is located below the neck region and releases thyroxine hormone. Vagus nerve innervates in the thyroid gland. Parasympathetic fibres of thyroid gland comes from the vagus nerve and symapthetic fibres is distributed in the superior, middle and inferior ganglia of sympathetic trunk of the thyroid gland.
Thus, vagus innervates in the thyroid gland.
Answer:
Vagus nerve
Explanation:
Vagus nerve is the cranial nerve that innervates the thyroid gland.
An injection of gamma globulin containing antibodies or antitoxin would be an example of ________ immunity.
a. Artificially acquired passive
b. Naturally acquired active
c. Artificially acquired active
d. Naturally acquired passive
Answer:
Option (A).
Explanation:
Artificial passive immunity can be acquired by injecting readymade antibodies. The antibodies are not produced by the recipient cells of the organism.
The injection of gamma globulin is artificially acquired passive immunity as these antibodies are injected directly into the body of the recipient. This immunity is given to provide short term immunization to an individual organism.
Thus, the correct answer is option A.
What happens to metabolism if calorie intake remains below BMR for a significant period of time?
Answer:
Explanation:
BMR is short for the basal metabolic rate. It is the rate of expenditure of the energy per unit time by the body at the time of rest. In other words it can be said that it is the the total amount of calories required to keep the body to do the necessary vital functions even in rest. Some of the activities which are regulated in the body even the body in the rest are breathing, control of the body temperature, control of blood circulation, and contraction of muscles all these activities require the expenditure of calories.
If the calorie intake becomes severely low than the basal metabolic rate will also get lower the body will not function as it should be.
Which question can be answered using the
i think A would be right if they are taking ab the scientific method
What is the major function of the neuron?
Answer:
Pass information by generating electric signals
Explanation:
Neurons are the fundamental unit of the nervous system. Neurons send information across the body through generation of electric signals called as action potential. There are basically three types of neurons
a) Sensory neurons which carry information from the sense organs in the form of impulse to the central nervous system (CNS)
b) Motor neurons – These carry information from the CNS to the body parts such as sense organs, muscles etc.
c) Interneurons – They are connecting neurons which are responsible for transferring information from one neuron to the other neuron.
Answer:
The major function of neuron is the transmission of nerve impulse.
Explanation:
Neurons or nerve cells are the electrically excitable cells that transmit information from one part of the body to another by transmitting nerve impulse. Neuron is the structural and functional unit of nervous system.
Sensory neurons carry nerve impulse from the receptor cell and transmit it to the brain. Inter neurons are present between sensory and motor neuron. Motor neurons carry information from the brain to the effector organ. Effector organ may be any muscles, glands or hormones.
What is the Glasgow Coma Scale for the following patient; opens eyes in response to pain, confused conversation, and withdraws to pain.
a)5
b)6
c)8
d)10
Answer: the correct answer is d) 10
Explanation: The Glasgow coma scale is used to assess patients in a coma. The initial score correlates with the severity of brain injury and prognosis. The Glasgow Coma Scale provides a score in the range 3-15; patients with scores of 3-8 are usually said to be in a coma.
Which of the following hormones is currently thought to decrease plasma calcium levels in pregnant women and children?
A. thyroid hormones
B. calcitonin
C. parathyroid hormone (PTH)
D. calcitriol
Answer:
Calcitonin
Explanation:
Calcitonin hormone is released by the para follicular cells of the thyroid gland. This hormone works against the parathyroid hormone.
Calcitonin hormone regulates the level of calcium by decreasing the blood calcium level. This hormone inhibits the osteoclast activity of the cells and decreases the absorption of calcium in pregnant women and child. Hence, calacitonin decreases plasma calcium levels in pregnant women and children.
Thus, the correct answer is option (B).
Where is gastrin produced, and what stimulates its production?
Answer:
Gastrin is a hormone of peptide origin that is secreted by the G cells in the pyloric antrum of the stomach, the duodenum and the pancreas, as a response to certain stimulus, like meals.
Its main function, is to activate the parietal cells of the stomach in order for them to start producing stomach acids, particularly HCI (hydrochloric acid), in order for digestion of proteins, and other such molecules, to be carried out. Another function of gastrin, aside from accelerating the production of gastric acid, is to stimulate stomach motility to ensure better mixing of the stomach acids with the contents in it for better digestion.
The reasons for why the production of gastrin is stimulated are: when the antrum of the stomach is distended, the presence of partially digested proteins, particularly amino acids, and finally, certain illnesses like hypercalcemia.
Which of the following is NOT an active part of the Blood-Brain-Barrier (BBB)?
a) endothelial cells
b) astrocytes
c) microglia
d) all of the above are part of the BBB
Weights of golden retriever dogs are normally distributed. Samples of weights of golden retriever dogs, each of size nequals15, are randomly collected and the sample means are found. Is it correct to conclude that the sample means cannot be treated as being from a normal distribution because the sample size is too small? Explain.
Answer:
The average weight in lbs. for a healthy golden retriever dog is between 75-85 LBS.
Explanation:
The sample size is too small, therefore the answer is true.
there is no indication in this question if the s. size is in lbs., kilos., or kilograms???
Which of the following statements regarding the endomembrane system is false? The endomembrane system is involved in the synthesis, storage, and export of important molecules. The endomembrane system includes the rough and smooth endoplasmic reticulum. The endomembrane system includes the nuclear envelope. The endomembrane system is a system of interrelated membranes that are all physically connected.
Answer:
Option (4).
Explanation:
Endomembrane system is may be defined as the sysytem that divides the cell into functional compartment or organelle. The organelle of endomembrane system are nuclear envelope, rough and smooth endoplasmic reticulum, golgi body, lysosomes, vesicle and plasma membrane.
Endomembrane system contains different membranes of cell organelle are suspended in the cytoplasm of the eukaryotic cell. Tge endomembrane system helps in synthesis, packaging and export of important proteins and molecules.
Thus, the correct answer is option (4).
Which unicellular gland is typically found in mucosal epithelium? A) Neuroepithelia cell B) Myoepithelia cell C) Goblet cell D) Merkel cell
Answer:
D
Explanation:
True or False. An ergometer is a device that accurately measures caloric expenditure.
Answer:
true..i think
Explanation:
Are the nodes of Ranvier spaced equally along the axon? Why is this significant?
Nodes of Ranvier are not equally spaced along an axon. Their strategic spacing allows for optimal saltatory conduction of action potentials, resulting in faster and energy-efficient transmission of the neural signal.
Explanation:The nodes of Ranvier found along the axon of a neuron, are not spaced equally. However, their spacing achieves an optimal distance for the propagation of action potentials. Myelin sheaths cover axons, providing insulation that prevents current leaks and enhances the speed at which action potentials are conducted. Nodes of Ranvier are gaps in this myelinated cover, where voltage-gated sodium (Na*) and potassium (K+) channels reside.
This spacing allows for a phenomenon called saltatory conduction, where the action potential 'jumps' from one node to the next, which results in faster and more efficient travel of the signal along the axon compared to if nodes were not present. If the nodes were spaced farther apart, the spread of depolarization may fall off too much to activate voltage-gated channels at the next node, and if closer together, the propagation speed would be slower.
Moreover, the presence of only these ion channels at the nodes rather than along the entire axon contributes to energy saving for the neuron. Thus, the nodes of Ranvier play a vital role in accelerating nerve impulse transmission and conserving energy for the neuron.
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"The nodes of Ranvier are not spaced equally along the axon. The spacing of the nodes of Ranvier is typically longer in larger-diameter axons and shorter in smaller-diameter axons. This unequal spacing is significant for several reasons related to the conduction of nerve impulses.
Firstly, the nodes of Ranvier play a crucial role in saltatory conduction, which is the rapid transmission of action potentials along myelinated axons. The myelin sheath, which is periodically interrupted by the nodes of Ranvier, acts as an insulator that prevents the electrical current from leaving the axon. The action potential jumps from one node to the next, allowing for faster conduction velocities compared to unmyelinated axons, where the action potential propagates continuously along the axon membrane.
Secondly, the spacing between nodes is optimized for the diameter of the axon. Larger-diameter axons have fewer nodes but each node can support a larger current, which contributes to a high conduction velocity. In contrast, smaller-diameter axons have more nodes, which are closer together, to maintain a sufficient safety factor for conduction. The safety factor is the ratio of the current available at a node of Ranvier to the current required to generate an action potential at the next node. A higher safety factor ensures reliable conduction even if some nodes are damaged or conditions are not optimal.
Lastly, the spacing of the nodes of Ranvier is also thought to be involved in the fine-tuning of nerve conduction velocities, which can be critical for the precise timing of neural circuits and the coordination of complex behaviors.
In summary, the nodes of Ranvier are not spaced equally along the axon, and this variable spacing is significant for efficient and reliable nerve impulse transmission, which is essential for the proper functioning of the nervous system."
The cellular organelle that is considered the site of respiration is the
a. Nucleus
b. lysosome
c. mitochondrion
d. rough ER
e. golgi apparatus
Answer:
c. mitochondrion
Explanation:
The mitochondrion is a double membrane-bound organelle present in eukaryotic cells only. It is the site for Kreb's cycle and oxidative phosphorylation and produces a large amount of energy stored in the form of ATP.
Since Kreb's cycle and oxidative phosphorylation are second and final stages of aerobic cellular respiration respectively, the mitochondrion is called a site of respiration in cells.
Translation requires
RNA only.
DNA, RNA, amino acids, and ribosomes.
DNA and RNA.
DNA, RNA, and ribosomes.
RNA, amino acids, and ribosomes.
Answer: RNA only.
Explanation:
Translation is a process of decoding of the molecules of messenger RNA and using it for the synthesis of the polypeptide, or a chain of an amino acids. The polypeptide chains coalesce to from the protein. The proteins are building blocks of lives. They are necessary for performing specialized functions in the body of the living being.
Translation involves DNA, RNA, amino acids, and ribosomes. The encoded information from DNA is copied into RNA, which is then used by ribosomes to assemble amino acids into a protein.
Explanation:Translation, in terms of genetics, primarily requires DNA, RNA, amino acids, and ribosomes. During translation, the genetic information stored in mRNA, which has been transcribed from DNA, is decoded by the ribosomes to form a sequence of amino acids, creating a protein. DNA serves as the original blueprint, RNA transfers the coded information, amino acids are the building blocks of the protein, and the ribosomes act as the sites where the protein synthesis occurs.
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Is the gracilis muscle located in the foot, hip, leg, or thigh muscle group?
The gracilis muscle is part of the thigh muscle group and is responsible for adducting the thigh and flexing the leg at the knee.
The gracilis muscle is located in the thigh muscle group. It is a slender muscle that lies on the medial side of the thigh, and its function is to adduct the thigh and flex the leg at the knee. This muscle is important in movements such as crossing your legs. While the gluteal group of muscles, which includes the gluteus maximus, gluteus medius, and gluteus minimus, is focused on movements related to the hip and femur, the gracilis muscle's primary functions are related specifically to the thigh and knee.
Which of the following grafts (transplant tissues) would be taken from elsewhere in a person's body?
a. Allograft
b. Autograft
c. Isograft
d. Xenograft
Answer: Allograft, Isograft and Xenograft.
Explanation: Grafting can be defined as a surgical procedure that is used to move a tissue from one part of the body to another or from another organism without bringing the blood supply along with the tissue.
Here, the grafting in which a piece of tissue or organ from another organism is introduced to person's body can be allograft, isograft and xenograft.
Allograft can be defined implanting tissue or organ from another individual of same species.
Isograft can be defined as implanting tissue or organ from genetically identical individual.
Xenograft can be defined as implantation of tissue or organ from different species.
So, the correct options are A, C and D
The _________ chamber has the thickest wall.
The two lower chambers are the ventricles, which have thick walls and force blood out of the heart by way of arteries The left ventricle has the thickest walls because it is the major pumping chamber of the heart.