Which one is not an excretory organ

Options

A. Skin
B. Kidneys
C. Intestine
D. Liver

Answer

To determine which option is not an excretory organ, we will analyze each option provided in the question: skin, kidneys, intestine, and liver.

### Step-by-Step Solution:

1. **Identify the Function of Each Organ:**
- **Skin:** The skin acts as an excretory organ by eliminating waste products through sweat. It contains sweat glands that excrete water and salts.
- **Kidneys:** The kidneys are major excretory organs responsible for filtering blood and excreting nitrogenous wastes, primarily urea, through urine.
- **Intestine:** The primary function of the intestine is digestion. While it does secrete digestive enzymes, it does not play a role in the excretion of waste products from the body.
- **Liver:** The liver is involved in the metabolism of various substances and converts ammonia into urea, which is then excreted by the kidneys. It also excretes other waste products.

2. **Analyze Each Option:**
- **Skin:** Excretory organ (excretes sweat).
- **Kidneys:** Excretory organ (excretes urea).
- **Intestine:** Not an excretory organ (primarily involved in digestion).
- **Liver:** Excretory organ (produces urea and excretes waste).

3. **Conclusion:**
- The organ that is not involved in excretion is the **intestine**. Therefore, the correct answer is option **C: Intestine**.

### Final Answer:
The organ that is not an excretory organ is the **intestine**.

---