The pineal gland releases the ____ hormone, which influences both circadian and circannual rhythms.

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The pineal gland releases the hormone melatonin, which plays a key role in regulating circadian and circannual rhythms. Melatonin levels rise in the evening and remain elevated throughout the night, helping to promote sleepiness and a sense of relaxation. In addition to its effects on the sleep-wake cycle, melatonin has also been linked to other physiological processes, such as immune function, mood, and cancer risk.

The Pineal Gland Releases the ____ Hormone, Which Influences Both