A glucose solution is to be injected into the blood stream. It must have the same....as the blood stream

Options

A. molarity
B. vapous pressure
C. osmotic pressure
D. viscosity

Answer

To solve the question regarding the glucose solution that is to be injected into the bloodstream, we need to determine what property it must have in common with the bloodstream.

### Step-by-Step Solution:

1. **Understanding the Context**: The question states that a glucose solution is to be injected into the bloodstream. This implies that the solution must be compatible with the blood to avoid any adverse effects.

2. **Identifying Key Terms**: The key term here is "isotonic." An isotonic solution has the same osmotic pressure as another solution, which in this case is the blood.

3. **Considering the Options**: The options provided are:
- Molarity
- Vapor pressure
- Osmotic pressure
- Viscosity

4. **Evaluating the Options**:
- **Molarity**: While molarity is a measure of concentration, it does not directly relate to the compatibility of the solution with blood.
- **Vapor Pressure**: This is not a relevant factor when considering the injection of a solution into the bloodstream.
- **Osmotic Pressure**: This is a critical factor. For the glucose solution to be safely injected, it must have the same osmotic pressure as the blood. If the osmotic pressure is not equal, it could cause the blood cells to either swell or shrink, which can be dangerous.
- **Viscosity**: While viscosity can affect how easily a solution can flow, it is not the primary concern when injecting a solution into the bloodstream.

5. **Conclusion**: The correct answer is that the glucose solution must have the same **osmotic pressure** as that of the bloodstream to ensure compatibility and safety.

### Final Answer:
The glucose solution must have the same **osmotic pressure** as the bloodstream.

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