During heavy exercise, what happens to the bicarbonate ion concentration in the blood? it decreases because it neutralizes the weak base formed during exercise. it decreases because it reacts with hydronium ions that form during exercise. it increases because more carbonic acid dissociates. it increases because of increased water intake

It decreases because it reacts with hydronium ions that form during exercise.

Explanation:

When you are exercising you need to keep the Ph on the blood on a neutral level, when you exercise the ph in your blood tends to be acidic, so in order to keep it on balance, on a neutral ph scale, your body the bicarbonate concentration in blood starts to decrease since it is needed to neutralize the hydronium that forms during exercise.