The change in function of the male reproductive system that is comparable to menopause in women is
A) called manopause.
B) not comparable between the aging male and female reproductive systems.
C) nothing; the male reproductive system does not change with age.
D) called the male climacteric.
E) None of the answers are correct.
D) called the male climacteric.
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The osteoclasts' two jobs are to tear down bone material and help move calcium and phosphate into the blood.
Answer the following statement true (T) or false (F)
Which of the following would be associated with the action of steroids on cells?
A) extracellular receptors with a specificity for only a single amino acid sequence on the hormone B) an enzyme that catalyzes the formation of cyclic AMP C) second-messenger systems D) a hormone-receptor complex that interacts directly with the cell's DNA
All hormones
a. are regulated by the hypothalamus b. initiate synthesis of new proteins c. are secreted by endocrine glands through ducts into the blood d. must combine with specific receptors on the target cells in order to exert their effects e. are eventually inactivated by enzymes in the liver, kidneys, blood, or target cells
The common passageway shared by the respiratory and digestive systems is the
A) larynx. B) glottis. C) vestibule. D) pharynx. E) trachea.