The H zone
a. is the area within the middle of the A band where the thin filaments do not reach
b. shortens or disappears during contraction
c. contains only thick filaments
d. does not contain cross bridges
e. is all of the above
E
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What are the pathological effects of renal failure?
What will be an ideal response?
If 0.9% NaCl (saline) solution is isotonic to a cell, then a 0.5% saline solution
A. will not affect the cell. B. is hypotonic to the cell. C. will cause crenation of the cell. D. will shrink the cell. E. is hypertonic to the cell.
Which of the following factors aids venous return to the heart?
a. Sympathetic stimulation of capillaries b. Skeletal muscle pump squeezing blood through veins c. Respiratory pump providing a pressure gradient between the lower and chest veins d. Both a and b e. Both b and c
All of the following are examples of tropic hormones secreted by the anterior pituitary except
A. TSH, which stimulates thyroid hormone secretion by the thyroid gland. B. prolactin, which stimulates milk production by the mammary glands. C. ACTH, which stimulates cortisol secretion by the adrenal cortex. D. All of the choices are examples of tropic hormones.