Moderate

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

Correct answer: B. Melatonin - ­pineal gland - regulates the normal rhythm of sleep wake cycle.

  • A. Oxytocin - posterior pituitary - growth and maintenance of mammary glands
  • B. Melatonin - ­pineal gland - regulates the normal rhythm of sleep wake cycle.
  • C. Progesterone - corpus luteum- stimulation of growth and activities of female secondary sex organs
  • D. Atrial natriuretic factor - atrial wall - increases the blood pressure

Explanation

Oxytocin is produced by the hypothalamus and generally secreted by the posterior pituitary. It stimulates the secretion of milk from mammary glands; causes contraction of the uterus at the time of childbirth. Progesterone is secreted by the corpus luteum. It stimulates the uterus for pregnancy, implantation, formation of the placenta and development of mammary glands. The atrial natriuretic factor is secreted by the atrial wall in response to an increased return of the venous blood. This hormone regulates the blood volume through increased excretion of ions and water.

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Coordination depends on receptors, neurons, synapses and nerve impulses, with reflex actions traced through the reflex arc and the roles of major brain regions. Chemical coordination covers endocrine glands and hormones, including how hormones regulate growth, metabolism, reproduction and internal balance, unlike rapid nervous control.

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