Which of the Following Statements Regarding Ca²⁺ Homeostasis Is True

question 110

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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