How do the kidneys contribute to the regulation of blood pH?
Releasing erythropoietin
Producing intrinsic factor
Increasing respiratory rate
Excreting hydrogen ions and reabsorbing bicarbonate
The Correct Answer is D
A. Releasing erythropoietin: This regulates red blood cell production, not blood pH.
B. Producing intrinsic factor: Intrinsic factor is produced in the stomach, not the kidneys, and relates to vitamin absorption.
C. Increasing respiratory rate: While this does regulate pH, it is a function of the lungs, not the kidneys.
D. Excreting hydrogen ions and reabsorbing bicarbonate: The kidneys maintain acid-base balance by excreting excess H+ ions (acid) into the urine and reabsorbing HCO3- (base) back into the blood.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Increasing sodium reabsorption: Aldosterone acts on the distal tubules and collecting ducts to increase sodium reabsorption, which leads to water retention and increased blood volume.
B. Enhancing potassium reabsorption: Aldosterone causes potassium excretion, not reabsorption.
C. Blocking renin secretion: Aldosterone is part of the RAAS pathway and does not block renin.
D. Promoting water excretion: Aldosterone indirectly promotes water retention, not excretion.
Correct Answer is B
Explanation
A. Intrinsic factor enhances vitamin B12 storage: Intrinsic factor is for absorption, not storage.
B. Due to the lack of intrinsic factor, vitamin B12 cannot be absorbed: This is the definition of the pathology in pernicious anemia—the failure to absorb B12 due to missing intrinsic factor.
C. Intrinsic factor is destroyed by liver enzymes: Intrinsic factor functions in the intestines and is not processed by the liver in this manner.
D. Excessive excretion of vitamin B12 in urine: The issue is a failure to get the vitamin into the blood in the first place, not a loss through the kidneys.
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