Which of the Following Statements Regarding Ca²⁺ Homeostasis Is TRUE

question 90

Multiple Choice

Which of the following statements regarding Ca²⁺ homeostasis is TRUE?

• A) Parathyroid hormone directly stimulates Ca²⁺ reabsorption by the kidneys.
• B) Parathyroid hormone directly stimulates Ca²⁺ absorption from the GI tract.
• C) In the absence of parathyroid hormone, plasma Ca²⁺ levels would be abnormally low, resulting in the hyperpolarization of nerve and muscle membranes.
• D) When plasma Ca²⁺ increases above normal, the secretion of parathyroid hormone increases.
• E) Vitamin D decreases the renal tubular reabsorption of Ca²⁺.

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