Question

Which of the following would help in prevention of
diuresis?
(1) Reabsorption of Na+ and water from renal
tubules due to aldosterone
(2) Atrial natriuretic
factor causes
vasoconstriction
(3) Decrease in secretion of renin by JG cells
More
water reabsorption due to
undersecretion of ADH
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Answer 1

Answer:

1)reabsorption of Na+and water from renal tubules due to aldstone

Explanation:

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Answer 2

Reabsorption of Na+ and water from renaltubules due to aldosterone would help in prevention of diuresis.

Answer:

Option 1 is right.

Explanation:

DIURESIS:

• Diuresis is the condition characterized by the excess loss of water through urine.

• The urine in this condition is not hypertonic.

• The excess water loss leads to the dehydration of the body.

• To restore the normal condition of the body, the excessive water eliminated through urine must be prevented.

PREVENTION OF DIURESIS:

• When the water level is low in the tissue, the osmoregulators are stimulated , they induce the release of ADH or anti diuretic hormone or vasopressin.

• ADH hormone prevent diuresis by reabsorption of water from the distal parts of nephron.

• JG cells or juxta glomerular cells are stimulated in response to low level of water in body.

• JG cells secretes renin . Renin increase the water reabsorption by increasing blood pressure. It causes vasoconstriction.

• Renin also induces the secretion of aldosterone from adrenal cortex.

• The aldosterone reabsorbs Na+ , which in turn leads to the reabsorption of water indirectly and hence the diuresis is prevented.

ATRIAL NATRIURETIC FACTOR:

• ANF is secreted by the atrial walls of heart.

• It works opposite to the renin angiotensin mechanism.

• When the blood pressure is increased , ANF is released.

• ANF decreases the blood pressure by vaso dilation.

• ANF does not prevent diuresis.