The elimination of insoluble calcium phosphate takes place by

Options

A. Liver
B. Kidney
C. Larger intestine
D. Skin

Answer

To solve the question regarding the elimination of insoluble calcium phosphate, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Calcium Phosphate**:
- Calcium phosphate is a salt that is largely insoluble in water. This means that it does not dissolve easily and remains as a solid in the body.

2. **Absorption of Calcium**:
- Calcium ions from calcium phosphate can be absorbed by the cells of the intestine as per the body's requirements. However, not all calcium phosphate can be absorbed.

3. **Excretion of Insoluble Calcium Phosphate**:
- The insoluble portion of calcium phosphate that cannot be absorbed is excreted from the body. This excretion primarily occurs through the digestive system.

4. **Role of the Large Intestine**:
- The large intestine plays a crucial role in the elimination of waste materials, including insoluble salts like calcium phosphate. After digestion and absorption in the small intestine, any remaining waste, including insoluble calcium phosphate, is passed into the large intestine.

5. **Final Excretion**:
- The waste material, including the insoluble calcium phosphate, is ultimately excreted from the body in the form of feces.

6. **Evaluating Other Options**:
- **Liver**: The liver is involved in metabolic processes but does not directly excrete insoluble calcium phosphate.
- **Kidneys**: The kidneys filter blood and excrete soluble waste products, but they do not handle insoluble calcium phosphate.
- **Skin**: The skin is involved in excretion (like sweat), but it does not play a significant role in the excretion of calcium phosphate.

7. **Conclusion**:
- Based on the above analysis, the correct answer to the question is that the elimination of insoluble calcium phosphate takes place through the **large intestine**, where it is excreted in feces.