What is the name of the contractile unit of a muscle fiber?

Answer:

c. RrMm x  RrMm

Explanation:

A dihybrid genotype is the one that is heterozygous for two genes. Hence, a dihybrid cross is a cross between two individuals that are hybrid for alleles of two different loci.

Among the given examples, the cross RrMm x RrMm is a dihybrid cross. Here, both given genotypes are heterozygous or hybrid for two loci (both genotypes have one dominant and one recessive allele for both the genes under study, R and r; M and m).

This cross explains the inheritance of two loci or two genetic traits. Hence, it is an example of dihybrid cross.

Answer:

a) Pyloric sphincter.

Explanation:

The function of Pyloric sphincter is defined as a band of smooth muscle that plays an important function in moving the contents of your stomach  in t the small intestine. In other words this muscle is at the junction between the   pylorus of the stomach and the duodenum of the small intestine.  

Answer:

Osteon is the structural unit of compact bone.

Explanation:

Compact bone is present around the medullary cavity and forms the external layer of the bones. Compact bone is made up of structural units called osteon.

Osteon is also known as haversian sysytem. Osteons contain mineral matrix and connencted by canaliculi. Osteons helps in the transportation of blood. Osteonic canal is known as haversian canal and aligned parallel with the long bones. Osteon contains lamellae that forms the layer of the compact matrix. Osteon prevents the bone from fracture and resist the bending of bones.

Final answer:

The osteon is the structural unit of compact bone, containing concentric lamellae around a central Haversian canal with blood vessels and nerves. Osteocytes in lacunae receive nutrients through canaliculi, illustrating the bone's intricate support system.

Explanation:

The structural unit of compact bone is the osteon, also known as the Haversian system. Each osteon is composed of concentric lamellae, which are rings of calcified matrix. The laminated rings encircle the central canal, or Haversian canal, that houses blood vessels, nerves, and lymphatic vessels. These osteons are the fundamental functional units that provide strength and support to compact bone, allowing it to resist various stresses.

The lamellae are arranged around the central Haversian canal, forming a cylindrical structure. Osteocytes, which are mature bone cells, reside in small cavities called lacunae within the lamellae. Nutrition for the osteocytes is transported through tiny channels called canaliculi that connect the lacunae to the Haversian canal. This sophisticated network allows for nutrients and waste to be efficiently exchanged, maintaining the health of bone tissue.

Furthermore, Volkmann's canals run perpendicular to the Haversian canals, providing an avenue for the vascular and nerve supply from the periosteum and endosteum to reach each osteon. This integration of structure and function makes the osteon an exceptional example of the complex architecture found in compact bone tissue.

Answer:

Breathing out the carbon dioxide

Explanation:

Blood is the medium through which carbon dioxide is transported to the lungs from where it is exhaled out.

The Carbon dioxide produced in cells after respiration diffuses into the blood  in exchange of oxygen delivered to the cells for further respiration. Blood while flowing through the lungs passes carbon dioxide to its alveoli which is then exhaled out and oxygen is inhaled from outside.

Hence, cell keep the carbon dioxide from building up in the cytoplasm and poisoning the cell by exhaling CO2.

Answer:

Which of the following are functions of lymphoid tissue?

A. furnish an ideal surveillance vantage point for lymphocytes and macrophages

B. house and provide a proliferation site for neutrophils

C. house and provide a proliferation site for lymphocytes

D. A and C

Explanation:

its A

Answer:

deep in the cortex

Explanation:

the T cells encounter antigens presented by dendritic cells in the deeper part of the cortex. The cortex is the outer area of the lymph node

Answer:

T cells ( The thymus cells) and B cells ( The bone marrow) are the major cellular components of the adaptive immune response . T cells are involved in cell- mediated immunity , whereas B cells are primarily responsible for humoral immunity

Explanation:

Your body can produce the most effective weapons that are against the invaders, which may be bacteria, viruses or parasites. Other types of T-cells recognise and kill virus-infected cells directly. Some help B-cells to make antibodies, which circulate and bind to antigens. A T-cell (orange) killing a cancer cell (mauve).

Answer: second pair

Explanation:

The sternal angle is a synarthrotic joint brings together by sternum body and manubrium. It marks approximately second pair of costal cartilages. Coastal cartilage is attached with second rib.

The complete statement is "The sternal angle indicates the location of the second pair of ribs."

The sternal angle, also known as the Angle of Louis or the manubriosternal joint, is an important anatomical landmark located at the junction between the manubrium (the upper part of the sternum) and the body of the sternum. It can be palpated as a prominent ridge or angle on the front of the chest.

The sternal angle serves as a reference point for various anatomical and clinical measurements. One notable significance of the sternal angle is that it corresponds to the level of the second pair of ribs. Specifically, it aligns with the cartilaginous connection between the second rib and the sternum.

Learn more about the sternal angle:

https://brainly.com/question/27974928

#SPJ6

Final answer:

Forensic anthropologists a)  apply anthropological techniques to legal matters, examining human remains to aid in criminal investigations and providing court evidence. They estimate vital statistics and use cultural cues for identification, often collaborating with law enforcement.

Explanation:

Forensic anthropologists a) apply anthropological techniques to legal matters. Their work focuses on the examination of human remains to identify deceased individuals and provide evidence in court. These professionals estimate an individual’s stature, health, injuries, sex, age, and lifestyle through analyzing bones and sometimes DNA. Forensic anthropologists may also use cultural cues such as clothing and jewelry to assist in identification. They collaborate with law enforcement and medical experts to piece together the story of a crime, often testifying as witnesses in trials. Forensic anthropology is a subfield of biological anthropology applied in real-world problems, such as the identification of individuals in mass graves, natural disaster victims, or crime victims. They play a crucial role in supporting law enforcement in identifying human remains and providing insights into the causes and circumstances of death.

Answer:

The erector spinae is NOT a muscle of respiration

Erector spinae the following is not a muscle of respiration. The correct option is B.

Thus, One of the core and paraspinal muscles, the erector spinae (ES) comes from the erector spinae aponeurosis (ESA) and is a big, superficial muscle that is located right under the thoracolumbar fascia.

With a proximal attachment on the sacrum and the spinous processes of the lumbar vertebra.

The ESA is a common aponeurosis that fuses with the thoracolumbar fascia.

Thus, Erector spinae the following is not a muscle of respiration. The correct option is B.

Learn more about Erector spinae, refer to the link:

https://brainly.com/question/31286455

#SPJ6

Answer:

The Heimlich maneuver is a procedure used to help a choking person who is conscious and unable to talk. The Heimlich maneuver pushes air out of the person's lungs and makes him cough. The force of the cough may then move the object out of his airway.

Answer:

Option (B).

Explanation:

Peyer's patches are the small masses of aggregated small lymphatic tissues and provide immunity to an organism. Peyer patches are discovered by the scientiest Johannan Cornard Peyer.

Peyer's patches are located in the ileum region of small intestine. These patches control the growth of harmful bacteria and regulates the growth of intestine bacteria. T

Thus, the correct answer is option (B).

Peyer's patches are found in the ileum of the small intestine, specifically concentrated in the distal ileum, and are important for immune function in the gut.

Peyer's patches, which are part of the mucosa-associated lymphoid tissue (MALT), are found in the ileum of the small intestine. These structures are lymphoid nodules that extend from the mucosa layer into the submucosa layer and play a crucial role in the body's immune response by sampling and responding to antigens present in the intestinal lumen. They are most prominent in the distal ileum and contain B lymphocytes in their germinal centers, along with T lymphocytes in the zones between follicles. Peyer's patches are covered by follicle-associated epithelium, which contains fewer goblet cells and includes specialized cells called microfold or M cells, which facilitate the uptake and transport of antigens.

Final answer:

The correct statement about a basic amino acid is that its positively charged R group could bind DNA. Basic amino acids have hydrophilic R groups on the surface of proteins and are polar, not hydrophobic. The correct answer is a. The positively charged R group of a basic amino acid could bind DNA.

Explanation:

The true statement regarding a basic amino acid is that the positively charged R group could bind DNA. Basic amino acids like lysine and arginine have hydrophilic and positively charged side chains that can interact with negatively charged molecules, such as DNA.

On the contrary, the hydrophilic R groups of basic amino acids would typically be located on the exterior of a protein to interact with the aqueous environment. Basic amino acids are considered polar due to their charge but are not hydrophobic. While they can form various types of bonds, including hydrogen and ionic bonds, they do not only form covalent bonds with other molecules.

Answer:

Epithelia has polarity and is avascular.

The papillary response of the right eye is the constriction of the pupil when a light is shone into it.

The papillary response of the right eye when a light is shone into the pupil is the constriction of the pupil. This is called the pupillary light reflex. When light enters the eye, it stimulates the photoreceptor cells in the retina. The information is then sent to the brain through the optic nerve, which triggers a response in the muscles of the iris to constrict the pupil. This helps regulate the amount of light entering the eye and protects the retina from excessive light exposure.

https://brainly.com/question/31719187

#SPJ6

K... lets break this down... LOL Verified answers be like  

its coronal!

Answer:

c. extensor digitorum

Explanation:

the extensor digitorum communis extends the phalanges, then the wrist, and finally the elbow. It tends to separate the fingers as it extends them. In the fingers, the extensor digitorum acts principally on the proximal phalanges, acting to extend the metacarpophalangeal joint.

Answer:

C

Explanation:

The globin of the RBC is broken down into constituent amino acids that can be reutilized by the phagocytic cells (this can occur in the spleen, liver and lymph node). The chains cannot be reused in their large form. The heme(iron) is transported by the blood to the bone marrow and is used to make new red blood cells.

Answer:

1. When the beginning of Earth occurred, there was little to no oxygen. So, some cells had to adapt to this and the process of anaerobic respiration allowed them to do so. In the grand scheme of things, there must have been a great number of anaerobic respiration occurring given the clement.

2. That probably would have caused the

atmosphere to cool down dramatically. The

cyanbacteria could have assisted, because it puts

oxygen into the atmosphere. The other autotrophs

would be affected, because if the temperature  

dropped, the air would have cooled down.

Then, the autotrophs would not have

food from the carbon dioxide, or

other inorganic materials.

Explanation:

Anaerobic respiration is a type of respiration that occurs in the absence of oxygen, the change in temperature will either lead to the cooling or heating of the atmosphere, and the cooling of the atmosphere means more oxygen which will affect the rate of anaerobic respiration in prokaryotes.

In the early stages of the earth the earth was void and there was very little oxygen present. due to the absence of oxygen it can be concluded that organisms adapted more through anaerobic respiration.

The drop in temperature will lead to the cooling of the atmosphere and decrease in carbon dioxide which will have an effect on the evolution of autotrophs relying on carbon dioxide and other inorganic materials for food. the activities of cyanobacteria contributes oxygen to the atmosphere hence the drop in temperature

Hence the changes in temperature affects the rate of anaerobic respiration and there was a larger percentage of anaerobic respiration during early earth.

Learn more : https://brainly.com/question/12522625

Answer:

Membrane receptor proteins

Transport proteins

Membrane enzymes

Explanation:

hope that helps

Answer:

The correct option is this: THE PRESENCE OF ALGAE.

Explanation:

Freshwater biome refers to bodies of water that contain relatively small amount of salt (typically about 1%) in comparison with the ocean. Examples of freshwater include: lake, ponds, streams, rivers, etc.

The freshwater biome is usually divided into different zones depending on the water depth and the amount of sunlight that is available at each depth.

The photic zone is the first layer of the water body, which receives direct sunlight. The large quantity of sunlight receive by this zone make it possible for photosynthesis to take place in the region.

This zone is very important because it made up of plants such as algae and phytoplankton, which are primary producers of the biome; the rest of the living creature in the water bodies depend on these plants to survive.  

Answer:

[tex]32 \frac{meter}{sec}[/tex]

Explanation:

Speed is defined as the distance traveled per unit time.

Distance traveled is equal to the difference between the initial and final position of the neuron.

Speed can be derived from under given equation -

[tex]\frac{delta (x)}{delta (t)}\\[/tex]

Where delta x is the change in distance

delta t is the change in time.

Substituting the given values in above equation we get -

[tex]\frac{\frac{7.20}{100} -\frac{3.70}{100} }{0.0063-0.0052} \frac{meter}{sec} \\= 31.81 \frac{meter}{sec} \\[/tex]

[tex]= 32 \frac{meter}{sec}[/tex]

There can be a time delay between the point of neuron stimulation to detection of action potential. Hence, two measurements are  needed.

The skin helps regulate body temperature through sweating and blood vessel constriction.

The skin plays a crucial role in regulating body temperature through a process called thermoregulation. When the body gets too hot, sweat glands in the skin produce sweat, which evaporates and helps to cool the body down. When the body gets too cold, the blood vessels in the skin constrict, reducing blood flow to the surface of the skin and conserving heat.

https://brainly.com/question/34188140

#SPJ6

The answer is rectum

Answer: The four cranial nerves involved in vision and movement of the eyes are the optic (I) nerve, oculomotor (III) nerve, trochlear (IV) nerve and the abducen (VI) nerve.

Answer:

Explanation:

Osteoporosis is a disease of bones. It occurs when bones loose density and structure of bone becomes porous. This condition leads to weaking of bones and the bones may break.

Causes : The low calcium diet in food, estrogen deficiency in women, Vitamin D deficiency and high levels of thyroid hormone secretion, too much alcohol consumption, smoking and medical condition of cystic fibrosis also result in bone weakening are responsible causes of osteoporosis.

Prevention : It can be prevented by medication, weight bearing physical exercises which can prevent loss of bones and provide strength, healthy diet with calcium and Vitamin D supplements.

Answer:

d. They always invade the human body from the external environment

Explanation:

Antigens are the molecules that have the ability to stimulate immune response and are mostly protein in nature. However, an antigen may be self or non-self molecule.

This means that antigen may enter the human body from the external environment (the non-self antigen) or any molecule present inside the body may serve as antigen (self-antigen). Self-antigens are responsible for autoimmune disorders.

Answer:

E

Explanation:

Aerobic respiration mainly occurs in the mitochondria of the cell and is known as the Krebs/Citric acid cycle. It begins when pyruvate from anaerobic respiration in the cytoplasm which is converted to acetyl-CoA before entering the Krebs cycle. Acetyl-CoA is transformed and the energy in its bond used to enable oxidation of NADH and FADH2. The H+ ions are pumped to the mitochondrial intermembrane space. The generated proton motive force is then used to generate ATPs by ATP synthase enzyme. Oxygen becomes the ultimate proton acceptor which is reduced to water. This whole process is facilitated by enzymes in the cell such as dehydrogenases.

Answer:

GABA

Explanation:

Purkinje neurons are located in the cerebellar cortex of an organism. These neurons receive impulse from the granule cells. These neurons were discovered by the czech scientiest Purkyne.

GABA ( Gamma amino butyric acid) is the only transmitter used by the purkinje cells for signalling. The GABA neurotransmitter blocks the neurotransmission and shows the inhibitory actions on cells.

Thus, the correct answer is option (D).

Answer:

c) double dissociation memory

Explanation:

The hippocampus is necessary for double dissociation memory, connecting memories of objects through space and time.

Final answer:

The hippocampus is essential for relational memory, allowing for the connection of memories across time and space, different than object recognition memory, double dissociation memory, or classical conditioning. So the correct option is a.

Explanation:

The hippocampus is necessary for relational memory, which is the ability to connect memories of objects through space and time. Relational memory enables us to understand how different pieces of information are related to one another, such as recognizing an environment and remembering the events that happened there. While the hippocampus is involved with various forms of memory, including declarative and episodic memory as well as recognition memory, learning and recall that involve linking together stimuli, such as those we experience over time and space, are crucially dependent on the hippocampus. This distinguishes relational memory from other types like object recognition memory (which involves recognizing objects but not necessarily placing them in spatial or temporal context), double dissociation memory (a concept that deals with how different parts of the brain are specialized for different functions), and classical conditioning (a form of learning involving stimuli, which primarily involves the cerebellum).

Hello There!

The muscle that turns the palm up is called the "Supinator"

The supinator muscle is in the forearm.