Biological rhythms (e.g. ,menstrual,sleep cycles)are regulated largely by the:
A) thyroid gland.
B) pineal gland.
C) parathyroid glands.
D) adrenal glands.

Question

Quizplus · Accepted Answer

Biological rhythms are primarily regulated by the pineal gland, which secretes the hormone melatonin. Melatonin helps to regulate sleep-wake cycles and other biological rhythms, such as seasonal reproduction in animals. The other glands listed (thyroid, parathyroid, and adrenal) have other functions in the body but do not play a primary role in regulating biological rhythms.

Biological Rhythms (E