Which statement is correct ?

Options

A. Every 100 ml of oxygenated blood can deliver around 5ml of `O_(2)` to
the tissues
B. Every 100 ml of oxygenated blood can deliver around 20 ml of `O_(2)` to
the tissues
C. Every 100 ml of oxygenated blood can deliver around 4 ml of `CO_(2)`
D. Every 100 ml blood can deliver around 4ml of `CO_(2)` to the tissues

Answer

To determine which statement is correct regarding the delivery of oxygen and carbon dioxide by blood, we will analyze each statement step by step.

### Step-by-Step Solution:

1. **Analyze the First Statement:**
- The statement claims that every 100 ml of oxygenated blood can deliver around 5 ml of oxygen to the tissues.
- This statement is correct. Hemoglobin in red blood cells binds with oxygen to form oxyhemoglobin (HbO2), and it is well-established that approximately 5 ml of oxygen is delivered per 100 ml of oxygenated blood.

2. **Analyze the Second Statement:**
- The second statement claims that every 100 ml of oxygenated blood can deliver around 20 ml of O2 to the tissues.
- This statement is incorrect. The correct amount is approximately 5 ml, not 20 ml.

3. **Analyze the Third Statement:**
- The third statement claims that every 100 ml of oxygenated blood can deliver around 4 ml of carbon dioxide.
- This statement is also incorrect. Oxygenated blood primarily carries oxygen, not carbon dioxide.

4. **Analyze the Fourth Statement:**
- The fourth statement claims that every 100 ml of blood can deliver around 4 ml of CO2 to the tissues.
- This statement is incorrect as well. Deoxygenated blood is responsible for carrying carbon dioxide from the tissues back to the lungs, not oxygenated blood.

### Conclusion:
The only correct statement is the first one: **Every 100 ml of oxygenated blood can deliver around 5 ml of oxygen to the tissues.**