Question

which of the following nutrients is needed for calcium absorption into the blood from the digestive system?

vitamin d
magnesium
growth hormone (gh)
vitamin k

Explanation:

Identify the physiological requirement for calcium absorption

Active transport of calcium across the intestinal mucosa requires calcitriol, the active form of Vitamin D.

Evaluate the given options

• Vitamin D: Directly stimulates the synthesis of calcium-binding proteins in the intestine to facilitate absorption.
• Magnesium: Essential mineral for bone structure and enzymatic reactions, but not the primary driver of intestinal calcium absorption.
• Growth Hormone (GH): Stimulates overall growth and bone mineralization indirectly, but is not a nutrient required for direct intestinal absorption.
• Vitamin K: Important for blood clotting and bone mineralization (osteocalcin activation), but does not mediate calcium absorption from the gut.

Answer:

• Vitamin D (Correct answer)
• Magnesium
• Growth Hormone (GH)
• Vitamin K