Question at position 2 The hormone calcitonin functions to:decrease the rate of calcium absorptionstimulate osteoclast activitydecrease the level of calcium ion in the blooddecrease the rate of calcium excretionstimulate osteoblasts and inhibit osteoclasts

Question

Question at position 2 The hormone calcitonin functions to:decrease the rate of calcium absorptionstimulate osteoclast activitydecrease the level of calcium ion in the blooddecrease the rate of calcium excretionstimulate osteoblasts and inhibit osteoclasts

BlackTom AI · Accepted Answer

The question asks about the function of the hormone calcitonin and provides several possible effects to evaluate.
Option 1: 'decrease the rate of calcium absorption' — Calcitonin is not primarily involved in reducing intestinal calcium absorption; that role is more associated with active vitamin D (calcitriol) and other regulatory factors. This statement misattributes calcitonin’s main action to the gut, making it incorrect.
Option 2: 'stimulate osteoclast activity' — Osteoclasts resorb bone, releasing calcium into the bloodstream. Calcitonin actually inhibits osteoclast activity to reduce bone resorption. Therefore, this option contradicts the known action of calcitonin and is incorrect.
Option 3: 'decrease the level of calcium ion in the blood' — This aligns with calcitonin’s physiologic role: by inhibiting osteoclasts and promoting bone deposition, it lowers circulating calcium levels. While the effect is part of a broader calcium-homeostasis system, this description matches calcitonin’s principal action and is correct.
Option 4: 'decrease the rate of calcium excretion' — Calcitonin’s effect is not primarily described as reducing renal calcium excretion. In fact, regulation of calcium reabsorption in the kidneys can involve other hormones like parathyroid hormone (PTH) and vitamin D metabolites. This option does not correctly describe calcitonin’s main action and is incorrect.
Option 5: 'stimulate osteoblasts and inhibit osteoclasts' — This phrase captures the net effect of promoting bone formation and reducing resorption, which is consistent with calcitonin’s actions. However, the way this option is stated could be interpreted as describing both promotion of osteoblast activity and inhibition of osteoclasts. While the second part is true, the wording omits the direct emphasis on lowering blood calcium and is not as precise as the classic description of calcitonin’s effect; depending on phrasing, it may be considered true in a broader sense, but it is not the most direct or canonical description of calcitonin’s primary function as typically tested.
Taking all options together, the statement that best captures calcitonin’s central action in physiological calcium homeostasis is the one describing a decrease in blood calcium levels due to inhibition of bone resorption. The incorrect options either attribute incorrect targets (gut absorption, osteoclast activation), misstate the renal effect, or provide a more indirect description that is less precise about the blood calcium outcome.

Question at position 2 The hormone calcitonin functions to:decrease the rate of calcium absorptionstimulate osteoclast activitydecrease the level of calcium ion in the blooddecrease the rate of calcium excretionstimulate osteoblasts and inhibit osteoclasts单项选择题

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