True statement about Ca++ absorption from intestines is:-
**Core Concept**
The absorption of **calcium (Ca++)** from the intestines is a crucial process for maintaining **bone health** and **calcium homeostasis**. This process involves the **small intestine**, particularly the **duodenum** and **jejunum**. **Vitamin D** plays a significant role in this process.
**Why the Correct Answer is Right**
Although the specific correct answer is not provided, the absorption of Ca++ is facilitated by **1,25-dihydroxyvitamin D**, which enhances the expression of **calcium transport proteins** in the intestinal epithelial cells. This active transport mechanism allows for the efficient absorption of calcium from the intestinal lumen.
**Why Each Wrong Option is Incorrect**
**Option A:** Without the specific details of option A, it's challenging to provide a precise explanation for its incorrectness.
**Option B:** Similarly, without knowing the content of option B, we cannot detail why it is incorrect.
**Option C:** And option C's incorrectness cannot be explained without its content.
**Option D:** The same applies to option D, as its specifics are required to discuss its flaws.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that **Vitamin D deficiency** can lead to impaired calcium absorption, resulting in conditions such as **rickets** in children and **osteomalacia** in adults.
**Correct Answer:** Correct Answer: D.