When the concentration of H⁺ increases above normal, for compensation the response is
A)decreased excretion of H+ in the urine
B)increased concentration of H+ in the plasma
C)increased reabsorption of all filtered bicarbonate ions
D)increased secretion of aldosterone from the posterior pituitary
E)synthesis of H+ by acid dissociation

Question

Quizplus · Accepted Answer

To compensate for an increased concentration of H⁺, the kidneys can reabsorb more bicarbonate ions from the urine. This bicarbonate then combines with the excess H⁺ in the plasma, forming carbonic acid (H₂CO₃), which then dissociates into water and CO₂. The CO₂ can then be eliminated through the respiratory system, further helping to compensate for the increased H⁺ concentration. Therefore, increased reabsorption of all filtered bicarbonate ions is the correct choice. The other options do not describe appropriate compensatory mechanisms.

When the Concentration of H⁺ Increases Above Normal, for Compensation