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(B) $1$. $Oxytocin$ is secreted by the posterior pituitary but its primary function is to stimulate uterine contractions and milk ejection,not the gro

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Melatonin - Pineal Gland - Regulates the sleep-wake cycle (acts as a biological clock).

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(B) $1$. $Oxytocin$ is secreted by the posterior pituitary but its primary function is to stimulate uterine contractions and milk ejection,not the growth of mammary glands (which is done by prolactin).$2$. $Melatonin$ is secreted by the pineal gland and plays a crucial role in regulating the $24$-hour (diurnal) rhythm of our body,such as the sleep-wake cycle and body temperature. This is correct.$3$. $Progesterone$ is secreted by the corpus luteum and supports pregnancy; it does not primarily stimulate the growth of secondary sexual organs (which is the function of estrogens).$4$. $ANF$ (Atrial Natriuretic Factor) is secreted by the atrial wall of the heart,not the ventricular wall,and it decreases blood pressure by causing vasodilation.

Select the correct match regarding the source and function of the hormone.

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

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