Excretory organs are the third line of defense against changes in [H⁺].

Question

Quizplus · Accepted Answer

The first line of defense against changes in [H+] is the respiratory system, which can adjust the pH of the blood by increasing or decreasing the rate of respiration. The second line of defense is the renal system, which can excrete or reabsorb H+ ions to adjust the pH of the blood. The third line of defense is the excretory organs, which can excrete H+ ions in the form of urine.

Excretory Organs Are the Third Line of Defense Against Changes