Judge the filtration claims

Exercise and reference answers

Questions

1. Reason

   About 180 litres of filtrate forms daily but only 1.5 litres of urine leaves.

   Verdict

   Both are true; the reason explains the assertion.

   Assertion

   Nearly 99 per cent of the glomerular filtrate is reabsorbed.

2. Reason

   Renin lowers glomerular blood flow to rest the kidney.

   Verdict

   The assertion is true and the reason is false.

   Assertion

   A fall in GFR makes the JG cells release renin.

3. Reason

   Each kidney holds nearly one million nephrons.

   Verdict

   Both are true; the reason does not explain the assertion.

   Assertion

   The nephron is the functional unit of the kidney.

Instructions

Read A and R, then tap the verdict that fits both.

Explanation