Secondary erectile dysfunction is due to biological factors.

Many people assume that hunger is normally triggered when energy resources fall

A) below a prescribed optimal homeostatic level called a set point. B) to the glucose level. C) to a fat set point. D) to the settling point. E) to the optimal levels of hypothalamic activity.

Depression that appears to be produced from within, perhaps by chemical imbalances in the brain, rather than as a reaction to life events are said to be

a. endogenous. b. exogenous. c. indigenous. d. erogenous.