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Art [367]
3 years ago
7

What causes skeletal muscle relaxation? A) nhibitory interneuron releases GABA onto muscle B) Descending neurons from brain dire

ctly inhibit muscle fibers C) Motor neuron does not fire action potentials E) Inhibitory motor neuron releases acetylcholine onto muscle
Biology
1 answer:
Molodets [167]3 years ago
5 0

Answer:

The correct option is C. Motor neuron does not fire action potentials

Explanation:

During contraction, the motor nerve passes down an action potential. A neuromuscular junction is formed by the motor neuron which stimulates the entry of calcium ions. The calcium ions bind to structures called as troponin which stimulates the binding of the filaments, actin and myosin. The filaments begin to contract by using ATP.

During relaxation, the action potential is stopped. Calcium is taken back into the sarcoplasmic reticulum. As a result, actin and myosin filaments do not link and hence, the contraction is stopped.

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Photosynthesis takes place in plants and plant like organisms. What do plants absorb from the air? Why is this
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Answer:

Plants take in Carbon Dioxide and filter it releasing oxygen.

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3 years ago
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If the fish in the previous exercise were small and blue, and your laser light were red, what corrections should you make?
Westkost [7]
Blue light bends more.
The laser would miss and you would need to aim below the fish.
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3 years ago
Human blood types are characterized by the presence absence of surface markers known as a tigers on the surface of red blood cel
zalisa [80]

Answer:

characterized by presence or absence of antigens

the blood types are A, B, O, AB

Explanation:

There are two antigens and two antibodies that are mostly responsible for the ABO types.  The specific combination of these four components determines an individual's type in most cases. Erythrocytes and serum were related to the presence of antigens on these erythrocytes and antibodies in the serum. these antigens  are A and B, and depending upon which antigen the erythrocytes express, blood either belonged to blood group A or blood group B. A third blood group contained erythrocytes that reacted as if they lacked the properties of A and B, and this group was later called "O" blood group. The fourth blood group AB, was added to the ABO blood group system. These erythrocytes expressed both A and B antigens.

Blood group   Antigen present on RBC    Antibodies in serum    Genotype(s)

      A                        antigen A                             anti-B                     AA or AO

      B                        antigen B                             anti-A                     BB or BO

      AB              both A and B antigen                 none                         AB

      O                           none                           anti-A and anti-B           OO

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3 years ago
A species that has experienced a severe bottleneck event would be expected to __________.
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E) be more susceptible to disease and famine

Hope this helps!

-Payshence

3 0
3 years ago
Prior to the invention of refrigeration, meat was often preserved by soaking it in brine (a solution of water with a high concen
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The brine is a hypertonic solution, thereby "pulling" the water out of the bacterial cells.
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3 years ago
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