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  • Pars distalis region of pituitary does not produce these hormones I.    Melanocyte stimulating hormone II.   &nb

Pars distalis region of pituitary does not produce these hormones

I.    Melanocyte stimulating hormone

II.    Vasopressin

III.    Prolactin

IV.    Growth hormone

 

 

Option: 1

I and IV

 


Option: 2

II and IV

 


Option: 3

II and III

 


Option: 4

I and II

 


Answers (1)

 

 

The Posterior Lobe or Neurohypophysis -

Hormones released from Posterior Lobe:

1. Oxytocin:

  • This hormone stimulates the contraction of smooth muscles of the uterus in pregnant women and causes easy childbirth. 
  • It also contracts the smooth muscles of mammary glands in lactating mothers and facilitates the flow of milk at the time of suckling. 
  • Oxytocin also stimulates the relaxation of the gallbladder, urinary bladder and intestine.

2. Vasopressin or Antidiuretic Hormone (ADH):

  • The primary function of vasopressin is to increase reabsorption of water in the distal convoluted tubules and collecting tubules of the kidney. 
  • So its deficiency in body increases the volume of urine causing diabetes insipidus. 
  • This type of diabetes is different from diabetes mellitus in that the urine is free from sugar.
  • Another important function of ADH is to bring about contraction of smooth muscles of the intestine, gallbladder, urinary bladder and blood vessels. 
  • Hence, large quantities of the hormone cause the arterial blood pressure to rise due to the contraction of peripheral, arterioles. 
  • Intake of alcohol reduces ADH secretion.
     

-

 

 

 

Pars distalis region is the adenohypophysis of pituitary and it does secrete MSH and vasopressin Hence, the correct option is d 

Posted by

Kshitij

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