Question

When blood calcium levels drop to a certain threshold level in humans, calcitonin release is no longer stimulated, which stops bone cells from releasing calcium into the blood. What of the following statements is most likely true of this coordinated response? A. Regulation of calcium in blood is essentially a genetically controlled mechanism that keeps calcium levels constant. B. Bone cells control calcium levels by either absorbing or releasing calcium in response to dietary calcium intake. C. Calcium is under positive feedback control so the body does not deplete its bone calcium reserves. D. This negative feedback mechanism involves endocrine organs and bone cells in balancing calcium distribution in the body.

          When blood calcium levels drop to a certain threshold level in humans, calcitonin release is no longer stimulated, which stops bone cells from releasing calcium into the blood. What of the following statements is most likely true of this coordinated response?

A. Regulation of calcium in blood is essentially a genetically controlled mechanism that keeps calcium levels constant.
B. Bone cells control calcium levels by either absorbing or releasing calcium in response to dietary calcium intake.
C. Calcium is under positive feedback control so the body does not deplete its bone calcium reserves.
D. This negative feedback mechanism involves endocrine organs and bone cells in balancing calcium distribution in the body.

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When blood calcium levels drop to a certain threshold level in humans, calcitonin release is no longer stimulated, which stops bone cells from releasing calcium into the blood. What of the following statements is most likely true of this coordinated response?

A. Regulation of calcium in blood is essentially a genetically controlled mechanism that keeps calcium levels constant.
B. Bone cells control calcium levels by either absorbing or releasing calcium in response to dietary calcium intake.
C. Calcium is under positive feedback control so the body does not deplete its bone calcium reserves.
D. This negative feedback mechanism involves endocrine organs and bone cells in balancing calcium distribution in the body.

Added by Daniel K.

Biology for AP Courses

Julianne Zedalis, John Eggebrecht

Instant Answer

Solved by Expert Adi S

06/29/2023

Step 1

Option B is partially true, as bone cells do play a role in regulating calcium levels by absorbing or releasing calcium. However, this statement does not mention the involvement of hormones and endocrine organs, which are crucial for this process. Option C is Show more…

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When blood calcium levels drop to a certain threshold level in humans, calcitonin release is no longer stimulated, which stops bone cells from releasing calcium into the blood. What of the following statements is most likely true of this coordinated response? A. Regulation of calcium in blood is essentially a genetically controlled mechanism that keeps calcium levels constant. B. Bone cells control calcium levels by either absorbing or releasing calcium in response to dietary calcium intake. C. Calcium is under positive feedback control so the body does not deplete its bone calcium reserves. D. This negative feedback mechanism involves endocrine organs and bone cells in balancing calcium distribution in the body.

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