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Questions
Single choice
The main effect of 1,25-dihydroxyvitamin D is to Blank ______.
Options
A.dissolve bony matrix, releasing calcium into the blood
B.increase absorption of dietary calcium in the intestines
C.increase calcium conservation in the kidneys
D.increase calcium excretion in the kidneys
E.darken the skin, to protect it from solar radiation
View Explanation
Standard Answer
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Approach Analysis
The question presents a basic physiology concept regarding the main action of 1,25-dihydroxyvitamin D.
Option 1: 'dissolve bony matrix, releasing calcium into the blood' This describes bone resorption, which is primarily mediated by parathyroid hormone (PTH) and osteoclast activity, not the direct action of actively circulating vitamin D. While vitamin D supports bone mineralization, this option overstates a resorptive ac......Login to view full explanationLog in for full answers
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