Most of the calcium in the body is in the

ATI LPN

ATI LPN Test Bank

A. bones B. plasma C. kidneys D. GI tract

Correct Answer: A

Rationale: Over 99% of body calcium is stored in bones as hydroxyapatite.

Under normal conditions, most water loss from the body is through the

A. skin B. kidneys C. lungs D. GI tract

Correct Answer: B

Rationale: The kidneys excrete the majority of water via urine under normal conditions.

Which of the following substances releases hydrogen ions into a solution?

A. acids B. bases C. salts D. glucose

Correct Answer: A

Rationale: Acids donate hydrogen ions, lowering pH.

Which of the following terms does not belong with the other three?

A. acidosis B. pH increases C. H⁺ ion concentration increases D. carbonic acid levels increase

Correct Answer: B

Rationale: pH increases indicates alkalosis, not acidosis like the others.

When normal buffer mechanisms are overwhelmed by excessive numbers of hydrogen ions, which of the following will result?

A. acidosis B. alkalosis C. neither of these D. None of the above

Correct Answer: A

Rationale: Excess H⁺ overwhelms buffers, causing acidosis (low pH).

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