If a healthy man drinks one litre of water on occasion A and one litre of $0.9 \%$ saline on occasio

Question

If a healthy man drinks one litre of water on occasion A and one litre of $0.9 \%$ saline on occasion B , what shall we expect in two hours?

Professor PC Thomas Classes · Answer

(b) : When a healthy man drinks one litre of water on occasion A it releases normal volume of urine and $\mathrm{Na}^{+}$concentration. But when he drinks one litre of $0.9 \%$ saline on occasion $B$ which is solution of NaCl , sodium concentration in blood increases and water follows it by osmosis. So, because of increase in absorption of water, volume of urine decreases and there will be no effect on $\mathrm{Na}^{+}$concentration in volume of urine.