The breakdown of complex glycogen molecules into simple glucose molecules is most accurately described as a(n)
a. anabolic reaction
b. metabolic reaction
c. catabolic reaction
d.homeostatic reaction

1. Which of the following examples demonstrates the principle of positive feedback?
a. A decrease in blood sugar stimulates the release of a hormone that increases blood sugar.
b. A decrease in room temperature activates a thermostat, which increases heat output by a furnace.
c. A rise in blood calcium levels stimulates the release of a hormone that lowers blood calcium levels.
d. A rise in estrogen levels stimulates the production of a hormone that stimulates estrogen.