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Identify the hormone with its correct matching of source and function:

1. (a) Oxytocin - posterior pituitary, growth and maintenance of mammary glands.
2. (b) Melatonin - pineal gland, regulates the normal rhythm of sleepwake cycle.
3. (c) Progesterone - corpus-luteum, stimulation of growth and activities of female secondary sex organs.
4. (d) Atrial natriuretic factor - ventricular wall increases the blood pressure.

Correct answer: (b) Melatonin - pineal gland, regulates the normal rhythm of sleepwake cycle.

Solution

Melatonin is secreted by the pineal gland and helps regulate the body’s normal sleep-wake cycle. The other options mismatch either the hormone’s source or its function.

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