Question

The hormones of posterior pituitary are oxytocin and vasopressin, but the latter is better known as

• A. Antidiuretic hormone
• B. Corticotrophic hormone
  
• C. Mineralocorticoids
• D. None of the above

Answer 1

The correct option is A Antidiuretic hormone

The posterior lobe of pituitary secretes two hormones: oxytocin and vasopressin. Oxytocin induces the contractions of smooth muscles of the uterus during the birth of the child and also stimulates myoepithelial cells of mammary glands to cause the release of milk during sucking y the infant. Thus, it is known as birth hormone and milk ejecting hormone. Vasopressin is also called anti-diuretic hormone. It decreases the loss of water in the urine by increasing the reabsorption of water in the distal convoluted tubules, collecting tubules and collecting ducts. Vasopressin also stimulates the contraction of smooth muscles of arterioles thereby enhancing the arterial blood pressure, hence its name vasopressin.

Thus, the correct answer is option A.