First slide

Human Endocrine System

Question

The absorption of Ca²⁺ from the gastrointestinal tract is promoted by

Moderate

A

calcitonin
B

melatonin
C

calcitriol
D

aldosterone

Solution

The hormone calcitriol is the active form of vitamin D formed in the kidneys under the influence of PTH. It increases the rate of Ca²⁺absorption from the gastrointestinal tract into the blood.

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