Read the assertion and reason carefully to mark the correct option out of the option given below:
Assertion: Volume and fluidity of intestinal contents have inceased in a person.
Reason : The person drank sea water.

Options

A. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
B. If both the assertion and the reason are true but the reason is a not correct explanation of the assertion
C. If the assertion is true but the reason is false
D. If both the assertion and reason are false

Answer

a

Explanation

(a) If sea water is drunk, its Mg^(2+) ions incraese the solute concentration in the intestinal lumen because `Mg^(2+)` is absorbed very slowly. On the contrary, `Mg^(2+)` draws water from the blood to the intestinal lumen by osmosis. So, water is not gained, but is lost from the blood on drinking sea water. Thus, there occurs increase in the fluidity and volumes of intestinal contents, in the same way this consequently stimulates intestinal paristalsis and evacuation of fluid faeces.