The substance present in higher concentration in blood than glomerular filtrate

Options

A. Plasma proteins
B. Urea
C. Water
D. Glucose

Answer

To solve the question "The substance present in higher concentration in blood than glomerular filtrate," we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: We need to identify which substance is found in a higher concentration in the blood compared to the glomerular filtrate.

2. **Know the Components of Blood**: Blood contains various components including red blood cells (RBCs), white blood cells (WBCs), plasma proteins, nutrients, waste products (like urea), and water.

3. **Understand Glomerular Filtration**: The glomerulus acts as a filter. It allows small molecules and water to pass into the filtrate while retaining larger molecules and cells in the blood.

4. **Identify the Size of Molecules**: Larger molecules such as plasma proteins (e.g., albumin) cannot pass through the filtration barrier of the glomerulus due to their size. In contrast, smaller molecules like urea, glucose, and water can pass through.

5. **Analyze the Options**:
- **Plasma Proteins**: These are large molecules and remain in the blood, thus they are present in higher concentration in blood than in the filtrate.
- **Urea**: This is a waste product that is smaller and can pass into the filtrate, so its concentration would be higher in the filtrate.
- **Water**: Water can also pass through the glomerulus, so its concentration would not be higher in the blood.
- **Glucose**: Glucose is also small enough to pass through the glomerulus and is usually reabsorbed, so its concentration would not be higher in the blood.

6. **Conclusion**: The only substance that is present in higher concentration in the blood than in the glomerular filtrate is **plasma proteins**.

### Final Answer:
**Plasma proteins** are present in higher concentration in blood than in glomerular filtrate.

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