Pressure which favours filtration and one which opposes filtration of blood are .... and ..... respectively

Options

A. Capsular hydrostatic pressure and glomerular osmotic pressure
B. Glomerular hydrostatic pressure and glomerular osmotic pressure
C. Glomerular osmotic pressure and glomerular hydrostatic pressure
D. Glomerular osmotic pressure and arterial pressure

Answer

To answer the question regarding the pressures that favor and oppose the filtration of blood, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Filtration in the Kidneys**:
- The first step in urine formation is the filtration of blood, which occurs in the glomerulus, a network of capillaries in the nephron.

2. **Identifying the Types of Pressure**:
- There are two main types of pressure involved in the filtration process:
- **Pressure that favors filtration**: This is the pressure that pushes fluid from the blood into the renal tubules.
- **Pressure that opposes filtration**: This is the pressure that resists the movement of fluid from the blood into the renal tubules.

3. **Determining the Favorable Pressure**:
- The pressure that favors filtration is known as **glomerular hydrostatic pressure**. This pressure is generated by the blood pressure in the glomerular capillaries and is crucial for the filtration process.

4. **Determining the Opposing Pressure**:
- The pressure that opposes filtration is known as **glomerular osmotic pressure**. This pressure is due to the presence of proteins in the blood plasma, which attracts water back into the capillaries, opposing the filtration process.

5. **Final Answer**:
- Therefore, the pressure that favors filtration is **glomerular hydrostatic pressure**, and the pressure that opposes filtration is **glomerular osmotic pressure**.

### Summary:
The pressures that favor and oppose the filtration of blood are **glomerular hydrostatic pressure** and **glomerular osmotic pressure**, respectively.

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