All connective tissue is derived from an embryonic tissue known as __________.
a. mesenchyme
b. reticular
c. cartilage
d. ground substance
Answer: a. mesenchyme
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When acetylcholine binds to receptors at the motor end plate, the muscle membrane becomes
A) More permeable to sodium ions. B) Less permeable to sodium ions. C) More permeable to potassium ions. D) Less permeable to potassium ions. E) Repolarized
When we get cold, our body compensates by shivering. In this example, what role do the muscles play?
A. Receptors B. Control centers C. Stimuli D. Effectors
Once a structure is fully grown and mature, it will probably
A. down-regulate its receptors for growth hormone, as it no longer receives as much of the ligand. B. up-regulate its receptors for growth hormone, as it no longer needs to continue to grow at a fast rate. C. up-regulate its receptors for growth hormone, as it no longer receives as much of the ligand. D. down-regulate its receptors for growth hormone, as it no longer needs to continue to grow at a fast rate.
One of the most crucial factors in the development of fatigue appears to be a depletion of ATP.
Answer the following statement true (T) or false (F)