Filtration of the blood takes place at

Options

A. PCT
B. DCT
C. collecting ducts
D. Malpighian

Answer

### Step-by-Step Solution:

1. **Understanding the Nephron Structure**: The nephron is the functional and structural unit of the kidney, consisting of several parts including the glomerulus, Bowman's capsule, proximal convoluted tubule (PCT), loop of Henle, distal convoluted tubule (DCT), and collecting duct.

2. **Identifying the Filtration Site**: The filtration of blood occurs primarily in the glomerulus, which is a network of capillaries. The blood enters the nephron through the afferent arteriole and is filtered in this capillary network.

3. **Role of Bowman's Capsule**: The Bowman's capsule surrounds the glomerulus and collects the filtrate that is produced during the filtration process. This combination of the glomerulus and Bowman's capsule is referred to as the Malpighian tubule.

4. **Understanding Other Parts**:
- The **PCT** is responsible for the reabsorption of nutrients and ions but does not filter blood.
- The **DCT** also involves reabsorption and secretion but is not the site of filtration.
- The **collecting duct** is involved in the final concentration of urine and does not participate in blood filtration.

5. **Conclusion**: The filtration of blood takes place specifically in the Malpighian tubule, which consists of the glomerulus and Bowman's capsule.

### Final Answer:
**The filtration of blood takes place at the Malpighian tubule (glomerulus + Bowman's capsule).**

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