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Which is NOT a part of the events that result in parathyroid hormone's control of blood calcium levels?

A. In response to low [tex][tex]$Ca^{2+}$[/tex][/tex] levels, cells of the parathyroid gland speed up synthesis of PTH (parathyroid hormone).
B. PTH acts on the kidneys to decrease excretion of calcium in the urine.
C. PTH stimulates the conversion of vitamin D into its active form (calcitriol).
D. PTH acts on the parafollicular cells of the thyroid gland to increase the level of the hormone calcitonin.
E. PTH increases the number and activity of osteoclasts, which dissolve bone matrix and release [tex][tex]$Ca^{2+}$[/tex][/tex] to diffuse into the bloodstream.



Answer :

GinnyAnswer

Final answer:

Parathyroid hormone (PTH) regulates blood calcium levels by stimulating osteoclasts, affecting kidney function, and initiating calcitriol production.


Explanation:

Parathyroid hormone (PTH) plays a crucial role in regulating blood calcium levels. However, PTH does not act on the parafollicular cells of the thyroid gland to increase the level of the hormone calcitonin. Instead, PTH stimulates osteoclasts, affects kidney function, and initiates the production of calcitriol for this purpose.


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