43. Endocrine System
Endocrine System
Multiple Choice
Multiple ChoiceHow does parathyroid hormone affect levels of Ca2+ in the blood?
A
When Ca2+ levels fall, PTH increases the matrix of bone and stimulates reabsorption of Ca2+ in the small intestines.
B
When Ca2+ levels rise, PTH stimulates the uptake of calcium in bones and the release of calcium in urine.
C
When Ca2+ levels rise, PTH stimulates the conversion of vitamin D to its active hormonal form in the kidneys and facilitates accumulation of calcium in bones.
D
When Ca2+ levels fall, PTH stimulates the conversion of vitamin D in the liver and stimulates bone cells to decompose the matrix of bone.
E
When Ca2+ levels fall, PTH stimulates bone cells to decompose the matrix of bone and stimulates reabsorption of Ca2+ in the renal tubules.
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