Peritubular capillary network is formed by

Options

A. Efferent arteriole
B. Afferent arteriole
C. Uniniferous tubule
D. Vasa recta

Answer

**Step-by-Step Solution:**

1. **Understanding the Structure**: The peritubular capillary network is a system of tiny blood vessels that surround the nephron, specifically the proximal convoluted tubule (PCT) of the cortical nephron.

2. **Identifying the Source of Peritubular Capillaries**: The peritubular capillaries are formed from the efferent arterioles. After blood is filtered in the glomerulus, it exits through the efferent arteriole.

3. **Evaluating the Options**:
- **Option A: Efferent Arteriole** - This is the correct answer because it is the efferent arterioles that give rise to the peritubular capillaries surrounding the PCT.
- **Option B: Afferent Arteriole** - This option is incorrect as the afferent arterioles bring blood into the glomerulus, not to the peritubular capillaries.
- **Option C: Uriniferous Tubule** - This is also incorrect. The uriniferous tubule is another name for the nephron, which does not directly form the peritubular capillaries.
- **Option D: Vasa Recta** - This option is incorrect as well. The vasa recta are specialized capillaries that supply the renal medulla, not the peritubular capillaries.

4. **Conclusion**: Based on the analysis of the options, the peritubular capillary network is formed by the efferent arterioles.

**Final Answer**: The peritubular capillary network is formed by the efferent arterioles.

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