Dietary Caffeine Increases the Loss of Calcium Through One's Urine

question 20

Multiple Choice

Dietary caffeine increases the loss of calcium through one's urine but is unlikely to cause a dangerous drop in blood calcium levels.The reason for this is that, in response to a drop in blood calcium,

• A) calcitriol is synthesized, which activates osteoclasts to break down bone.
• B) corticotropin-releasing hormone causes cortisol to be secreted, which triggers the kidneys to retrieve calcium from the urine.
• C) the adrenal cortex secretes mineralocorticoids, which cause minerals such as calcium to be resorbed from bone.
• D) aldosterone stimulates the kidneys to conserve calcium and excrete potassium.
• E) parathyroid hormone is secreted, which causes resorption of calcium from bone and retention of calcium by the kidneys.

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