Filtrate in the nephron is reabsorbed from the renal tubules back into the :

Options

A. glomerulus
B. peritubular capillaries
C. afferent arteriole
D. efferent arteriole

Explanation

To solve the question "Filtrate in the nephron is reabsorbed from the renal tubules back into the:", we will analyze the options provided and understand the process of reabsorption in the nephron.

### Step-by-Step Solution:

1. **Understanding the Nephron Structure**: The nephron is the functional unit of the kidney, consisting of a glomerulus and a renal tubule. The renal tubule includes the proximal convoluted tubule (PCT), loop of Henle, distal convoluted tubule (DCT), and collecting duct.

2. **Filtrate Formation**: Filtrate is formed in the glomerulus through a process called glomerular filtration. This filtrate contains water, ions, glucose, amino acids, and waste products.

3. **Reabsorption Process**: After the filtrate is formed, it travels through the renal tubules. During this journey, essential substances such as water, glucose, and certain ions are reabsorbed back into the bloodstream.

4. **Identifying the Site of Reabsorption**: The reabsorption of these substances primarily occurs in the proximal convoluted tubule (PCT) and continues along the renal tubules.

5. **Understanding Blood Supply**: The blood supply to the nephron is through the afferent arterioles which lead to the glomerulus, and the efferent arterioles which carry blood away from the glomerulus. The peritubular capillaries surround the renal tubules and are crucial for the reabsorption process.

6. **Finalizing the Correct Answer**: Among the options given:
- Glomerulus: This is where filtration occurs, not reabsorption.
- Peritubular capillaries: These are the tiny blood vessels that receive reabsorbed substances from the renal tubules.
- Afferent arterioles: These bring blood to the glomerulus, not involved in reabsorption.
- Efferent arterioles: These carry blood away from the glomerulus, not directly involved in reabsorption.

Thus, the correct answer is **Peritubular capillaries**.

### Final Answer:
Filtrate in the nephron is reabsorbed from the renal tubules back into the **peritubular capillaries**.

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