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Which increases the rate of Ca^(2+) abso...

Which increases the rate of `Ca^(2+)` absorption from gastrointestinal tract

A

Calcitriol

B

Calcitonin

C

Aldosterone

D

Cholecystokinin.

Text Solution

AI Generated Solution

The correct Answer is:
To determine which substance increases the rate of calcium absorption from the gastrointestinal tract, we can analyze the provided options step by step. ### Step-by-Step Solution: 1. **Understanding Calcium Absorption**: Calcium absorption in the gastrointestinal tract is a critical process regulated by various hormones. The question specifically asks which hormone increases this absorption. 2. **Reviewing the Options**: - **Option A: Calcitriol**: This is the active form of Vitamin D. It is known to enhance the absorption of calcium and phosphorus in the intestines. Therefore, it is a strong candidate for increasing calcium absorption. - **Option B: Calcitonin**: This hormone is produced by the thyroid gland and is responsible for lowering blood calcium levels by inhibiting bone resorption and promoting calcium excretion in the kidneys. It does not increase absorption. - **Option C: Aldosterone**: This hormone is primarily involved in regulating sodium and potassium levels in the kidneys. It does not play a role in calcium absorption. - **Option D: Cholecystokinin**: This hormone is involved in digestion and stimulates the release of bile and pancreatic enzymes. It does not directly influence calcium absorption. 3. **Identifying the Correct Answer**: Given the functions of the hormones listed, **Option A: Calcitriol** is the only hormone that increases the rate of calcium absorption from the gastrointestinal tract. 4. **Conclusion**: The correct answer is **Calcitriol**. ### Final Answer: **Calcitriol (Option A)** increases the rate of `Ca^(2+)` absorption from the gastrointestinal tract.
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