Potassium levels in the body are regulated by

ATI LPN

ATI LPN Test Bank

A. ADH B. PTH C. calcitonin D. aldosterone

Correct Answer: D

Rationale: Aldosterone regulates potassium by promoting its secretion in the kidneys.

The main regulator of serum phosphate levels is a transport process in the

A. liver B. kidneys C. pancreas D. small intestine

Correct Answer: B

Rationale: The kidneys regulate phosphate excretion via PTH.

Which of the following is an example of water conservation by the body?

A. diarrhea B. perspiration C. decreased water intake D. decreased urine volume

Correct Answer: D

Rationale: Decreased urine volume, via ADH, conserves water.

Chemicals that function to minimize changes in the pH of body fluids are called

A. buffers B. inhibitors C. accelerators D. activators

Correct Answer: A

Rationale: Buffers resist pH changes by binding or releasing hydrogen ions.

Mr. I.M.A. Wreck's plasma pH is 7.2. Which of the following indicates that the body is attempting to compensate and return the body pH to normal?

A. an increase in respiration rate B. a decrease in respiration rate C. no change in respiration rate D. None of the above

Correct Answer: A

Rationale: Increased respiration blows off CO₂ reducing H⁺ to correct acidosis.

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