When do the testes start secreting testosterone?
A) In the first three years of adolescence
B) In the first trimester after birth
C) In the first trimester of fetal development
D) After the first ejaculation
E) In the first three years after birth
C
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Arteries carry blood __________________________________________________ (direction) the heart
Fill in the blank(s) with correct word
Explain why starch digestion by salivary amylase stops within the stomach cavity
A) Stomach acids inactivate the amylase. B) Gastric amylase assumes the function of starch digestion. C) Starch digestion is completed on reaching the stomach. D) Salivary amylase is inactivated by the high temperature within the stomach.
The primary integrator of body temperature control reflexes is the
A. adrenal medulla. B. thyroid gland. C. cerebral cortex. D. medullary cardiovascular center. E. hypothalamus.
Pepsin would be missing from the stomach contents of a person lacking
A) chief cells. B) enterochromaffin-like cells C) goblet cells. D) parietal cells.