The peritubular capillaries of the nephron arise from the:

Options

A. Afferent arteriole
B. Efferent arteriole
C. Renal artery
D. Arcuate artery

Answer

To solve the question regarding the origin of the peritubular capillaries in the nephron, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of the Nephron**:
- The nephron is the functional unit of the kidney, consisting of various parts including the glomerulus, Bowman's capsule, proximal convoluted tubule (PCT), and others.

2. **Identify the Role of the Glomerulus**:
- The glomerulus is a network of capillaries where blood filtration occurs. It receives blood from the afferent arteriole and filters it, leading to the formation of urine.

3. **Determine the Blood Flow Direction**:
- After filtration in the glomerulus, the blood that has been filtered exits through the efferent arteriole.

4. **Locate the Peritubular Capillaries**:
- The peritubular capillaries are small blood vessels that surround the nephron tubules. They arise from the efferent arteriole, which carries blood away from the glomerulus.

5. **Conclude the Origin of Peritubular Capillaries**:
- Since the peritubular capillaries are formed from the blood that exits the glomerulus via the efferent arteriole, we can conclude that the peritubular capillaries arise from the efferent arteriole.

### Final Answer:
The peritubular capillaries of the nephron arise from the **efferent arteriole**.

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