Q.Pineal gland is an endocrine gland, write its role.

Step 1. The pineal gland, located behind the third ventricle of the brain, secretes the hormone melatonin.

Step 2. Melatonin's central role is regulating the circadian rhythm of the body — the roughly 24-hour cycle underlying the normal sleep-wake cycle; its secretion rises at night and is suppressed when light strikes the retina.

Step 3. It also regulates the timing of sexual maturation of the gonads. …

State the pineal gland's single hormone (melatonin) and list each o …

• Naming only the sleep-wake role and omitting melatonin's other stated effects (gonadal timing, metaboli …