During the menstrual cycle, what triggers ovulation to occur?
a. A gradual decrease in estrogen levels.
b. Inhibin B sharply spikes.
c. A surge in progesterone occurs.
d. Activin is released.
ANS: B
Inhibin B is primarily secreted in the follicular phase of the cycle and sharply spikes when ovula-tion occurs. Ovulation is not associated with estrogen, progesterone, or activin.
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