Question

Assertion : In proximal convoluted tubule glomerular filtrate becomes hypertonic to blood plasma.

Reason : HCO3- is absorbed only in the proximal convoluted tubule.

(a) Both A and R are true and R is the correct explanation of A.

(b) Both A and R are true but R is not correct explanation of A

(c) A is true but R is false

(d) A and R are false

Answer 1

The correct option is (d) A and R are false.

Explanation:

In proximal convoluted tubule (PCT) about 65% of the glomerular filtrate is reabsorbed normally. Here most of the solutes are reabsorbed making the filtrate isotonic to blood plasma. HCO3- is not absorbed in PCT.