Biliverdin and bilirubin are excreted mainly along with

Options

A. Urine
B. Faeces
C. Sweat
D. Vitamins

Explanation

**Step-by-Step Solution:**

1. **Understanding Biliverdin and Bilirubin Formation:**
- Biliverdin and bilirubin are products of hemoglobin breakdown. When red blood cells (RBCs) reach the end of their lifespan, they are broken down, and hemoglobin is released.

2. **Conversion Process:**
- Hemoglobin is converted into biliverdin, which is then further reduced to bilirubin. This process occurs mainly in the liver and spleen.

3. **Excretion Pathways:**
- Bilirubin is primarily excreted from the body through bile, which is then stored in the gallbladder and released into the intestines. In the intestines, bilirubin is converted into stercobilin, which gives feces their characteristic color.
- Biliverdin can also be excreted, but it is less common. It is usually converted to bilirubin before excretion.

4. **Final Excretion Forms:**
- Bilirubin is excreted mainly in the form of stercobilin in feces and urobilin in urine.
- Therefore, the main excretion products are stercobilin (from bilirubin) in feces and urobilin (from bilirubin) in urine.

5. **Conclusion:**
- Biliverdin and bilirubin are excreted mainly along with urine (as urobilin) and feces (as stercobilin).

**Answer: Biliverdin and bilirubin are excreted mainly along with urine and feces.**

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