Question

current attempt in progress
although damian is not traveling, he has trouble with his sleep/wake cycle. he seems to have a lot of difficulty:iculty sleeping at night when it is dark out. instead, his body wants to sleep in the middle of the day when it is bright daylight out. he may have a problem with his___that secretes___.
thyroid gland; dopamine
pineal gland; melatonin
thyroid gland; melatonin
pineal gland; dopamine

Explanation:

The pineal gland is responsible for secreting melatonin, a hormone that regulates the sleep - wake cycle. Darkness stimulates the production of melatonin, promoting sleep. The thyroid gland is not related to regulating the sleep - wake cycle with respect to melatonin production, and dopamine is not secreted by the pineal gland for sleep regulation.

Answer:

B. pineal gland; melatonin