Progesterone secreted by the placenta suppresses ______ to prevent maturation of ovarian follicles.

In which sleep disturbance does the person suffer from muscle twitches, primarily in the legs, that occur every 20 to 40 seconds, severely interrupting his or her sleep?

a. narcolepsy b. somnambulism c. hypnic jerk syndrome d. periodic limb movement syndrome

Approximately _________ percent of auditory nerve fibers make connections with outer hair cells, whereas _________ percent make connections with inner hair cells

a. 5; 95 b. 25; 75 c. 50; 50 d. 95; 5