Question

When a liter of water is introduced in human blood

• A. BMR decreases
• B. RBCs collapse and urine production increases
• C. BMR increases
• D. RBCs collapse and urine production decreases

Answer 1

The correct option is B RBCs collapse and urine production increases

A) BMR is almost unaffected by the introduction of water.

B) When too much water is introduced into the blood externally, it lyses the RBCs and triggers the release of ANF which counters the action of ADH (which makes urine more concentrated to save water) and creates more diluted urine.

C) BMR (basal metabolic rate) increases with the intake of water, but this change is not drastic and not very significant, so it can be neglected.
D) RBCs collapse but urine production increases.
So the correct answer is 'RBCs collapse and urine production increases'.