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Vitamin D Regulation and Mechanism

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Questions and Answers

What is the role of retinol binding protein in the transport of retinol?

To facilitate the function of retinol in the liver
To regulate gene expression in target cells
To bind to retinol and transport it to extrahepatic tissues (correct)
To convert retinol to retinoic acid

What is the function of retinol in the retina?

To convert into retinal essential for vision (correct)
To regulate gene expression
To maintain fetal life in females
To support sperm formation

How many genes have been shown to be directly regulated by retinoic acid?

At least 200 genes
At least 50 genes
At least 130 genes (correct)
At least 100 genes

What is the role of retinol in maintenance of epithelial cells?

To maintain normal differentiation of epithelial cells (D) Signup and view all the answers

What is the role of retinol in reproduction?

To support sperm formation in males and maintain fetal life in females (A) Signup and view all the answers

What is the function of retinoic acid in cells?

To bind to specific nuclear receptors (B) Signup and view all the answers

What is the outcome of retinoic acid binding to specific nuclear receptors?

Stimulation of gene expression (C) Signup and view all the answers

What is the role of retinol in the maintenance of the cornea?

To maintain the integrity of the cornea (B) Signup and view all the answers

What is the mode of action of retinoic acid similar to?

Hormones (D) Signup and view all the answers

What is the function of retinol in growth and development?

To support normal growth and development (A) Signup and view all the answers