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Chemical Coordination and integration — BIOLOGY STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceBIOLOGYChemical Coordination and integration3 Marks
Question
Which hormones are secreted by the posterior pituitary gland? What function does each serve? Where are these hormones actually produced? How are these hormones transported to the region from where they are released?
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Answer

Oxytocin and vasopressin are secreted by the posterior pituitary gland.
  1. Oxytocin: is released into the blood when hypothalamic neurons are stimulated by the widening of uterus at the time of delivery or by the sucking of breasts by an infant. It induces contraction of smooth muscles of the uterus during the birth of a youngone and myoepithelial cells of mammary glands to cause release of milk during sucking by an infant. Therefore, it is also known as 'birth hormone'.
  2. Vasopressin: is also called Antidiuretic Hormone (ADH). It decreases the loss of water in urine by increasing reabsorption of water in distal convoluted tubules, collecting tubules and collecting ducts of kidneys.

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