The hormone ______ is a key factor in regulating a person's level of sleepiness.
A) testosterone
B) melatonin
C) estrogen
D) glutamate

Question

Quizplus · Accepted Answer

The hormone melatonin is produced by the pineal gland in the brain and is a key regulator of sleepiness. It is known as the "sleep hormone" and is responsible for the natural sleep-wake cycle in humans. Melatonin levels rise in the evening, signaling the body that it is time to sleep, and decrease in the morning, signaling that it is time to wake up.

The Hormone ______ Is a Key Factor in Regulating a Person's