Which of the following is NOT an effect of aging on the female reproductive system?
A. Ovaries become unresponsive to pituitary gonadotropic hormones.
B. Sexual desire declines.
C. Osteoporosis increases.
D. External genitals atrophy.
Answer: B
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As blood flows through the vasa recta alongside the ascending limb of the nephron loop, the blood is flowing
A. toward the cortex. B. deep into the medulla.
An important phagocytic cell in the immune system is the:
a. B cell b. plasma cell c. neutrophil d. memory cell
Why is the rate of CO2 exchange roughly equivalent to that of O2 despite its less steep pressure gradient?
A. CO2 diffuses much more rapidly out of the cells. B. CO2 binds to O2 and moves across the respiratory membrane simultaneously. C. CO2 is more soluble in water than is O2. D. CO2 is actively transported into the alveoli.
To focus on objects closer than 20 feet,
A. the lens must become flatter. B. the cornea must move inward. C. the retina must bend. D. the ciliary muscles must contract. E. the suspensory ligaments increase tension on the lens.