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Question

The hormones vasopressin (ADH) and oxytocin are released by 



A

Anterior lobe of pituitary

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B

Middle lobe of pituitary 

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C

Posterior lobe of pituitary

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D

Hypothalamus

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Solution

The correct option is C

Posterior lobe of pituitary


The posterior lobe of pituitary releases, vasopressin and oxytocin. Both these hormones are synthesised in the hypothalamus and are carried to the posterior pituitary where they are stored. From posterior pituitary, they are released into the blood.

1. Vasopressin or Antidiuretic hormone (ADH) -  It is released from posterior pituitary in response to stress and dehydration. It increases the reabsorption of water in the distal convoluted tubules and the collecting tubules of the kidney. So its deficiency in the body increases the urine flow causing diabetes insipidus. It also raises blood pressure by constricting the peripheral blood vessels.

2. Oxytocin is an important uterus-contracting hormone released at the time of childbirth. It also acts on mammary glands and helps in the expulsion of milk at the time of suckling. It is, therefore, also known as `milk-ejection hormone’ and `birth hormone’. It decreases the blood pressure by dilating the peripheral blood vessels (opposite to that of vasopressin).


Biology

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