Question

question 33
regulation of calcium levels is regulated by all of the following except:
a high calcium levels
b parathyroid hormone
c calcitonin
d aldosterone

Explanation:

• Parathyroid hormone: Increases blood calcium levels when they are low by promoting bone resorption, increasing calcium reabsorption in the kidneys, and enhancing calcium absorption in the intestines.
• Calcitonin: Decreases blood calcium levels when they are high by inhibiting bone resorption.
• Aldosterone: Mainly regulates sodium and potassium balance, not calcium levels. High calcium levels themselves can trigger the release of calcitonin (a negative - feedback mechanism), but they are not a regulatory "factor" in the sense of a hormone or a distinct regulatory molecule like the others.

Answer:

D. Aldosterone