Which of the following statements regarding calcium homeostasis is true?
A) Parathyroid hormone directly stimulates calcium reabsorption by the kidneys
B) Parathyroid hormone directly stimulates calcium absorption from the GI tract
C) In the absence of parathyroid hormone, plasma calcium ion levels would be abnormally low, resulting in the hyperpolarization of nerve and muscle membranes
D) Both parathyroid hormone directly stimulates calcium reabsorption by the kidneys and parathyroid hormone directly stimulates calcium absorption from the GI tract are true
E) Both parathyroid hormone directly stimulates calcium reabsorption by the kidneys and in the absence of parathyroid hormone, plasma calcium ion levels would be abnormally low, resulting in the hyperpolarization of nerve and muscle membranes are true
Correct Answer:
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