Calcitriol, Popularly Known as the Active Form of Vitamin D

question 82

Multiple Choice

Calcitriol, popularly known as the active form of vitamin D, is a hydrophobic hormone. Which of the following is most likely to be a correct statement about calcitrol signaling?

• A) Calcitriol binds to a transporter to cross the membrane.
• B) Calcitriol binds to plasma membrane receptors.
• C) Calcitriol forms hormone-receptor complexes in the cytoplasm.
• D) Calcitriol exerts its effects by stimulating an intracellular second messenger system.

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