When explaining the body's compensatory mechanisms to maintain a normal pH, the health care provider knows that the renal system:
A) Works slower than the respiratory system, going into action 1 to 2 days after H+ remain elevated
B) Will absorb more bile acids to try to normalize elevated H+ levels
C) Will absorb more Na+ and water to dilute the elevated H+ in an effort to normalize pH
D) Waits until the lungs have increased the respiratory rate to try to blow off excess CO2
Ans: A
Feedback:
Only the kidney can eliminate hydrogen from the body. Virtually all the excess H+ excreted in the urine are secreted into the tubular fluid by means of tubular secretory mechanisms. The ability of the kidneys to excrete large amounts of H+ in the urine is accomplished by combining the excess ions with buffers in the urine. The three major urine buffers are HCO3–, phosphate (HPO42–), and ammonia (NH3). An important aspect of this buffer system is that the deamination process increases whenever the body's hydrogen ion concentration remains elevated for 1 to 2 days.
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