Question

multiple choice question which hormone is secreted by the pineal gland? melatonin epinephrine serotonin acetylcholine

Explanation:

The pineal gland is responsible for secreting melatonin which plays a key - role in regulating sleep - wake cycles. Epinephrine is secreted by the adrenal glands. Serotonin is produced in the intestines and brain. Acetylcholine is a neurotransmitter, not a hormone secreted by the pineal gland.

Answer:

Melatonin