Which of the following is a more accurate statement about respiration

Options

A. `O_(2)` from atmosphere diffuses into blood and combines with haemoglobin of blood plasma
B. Blood does not have any important role in `O_(2)` transport
C. Respires anaerobically
D. `O_(2)` diffused from air combines with haemoglobin of RBCs.

Answer

To determine the most accurate statement about respiration, we will analyze the provided options step by step.

### Step-by-Step Solution:

1. **Understanding Respiration**:
- Respiration involves two main processes: external respiration (breathing) and internal respiration (cellular respiration).
- External respiration refers to the exchange of gases (oxygen and carbon dioxide) between the atmosphere and the blood.

**Hint**: Remember that respiration includes both the physical act of breathing and the biochemical processes that occur in cells.

2. **Analyzing Option 1**:
- The statement claims that "oxygen from the atmosphere diffuses into the blood combined with hemoglobin of the blood plasma."
- This is incorrect because hemoglobin is not found in the plasma; it is contained within red blood cells (RBCs).

**Hint**: Focus on where hemoglobin is located in the blood to evaluate this statement.

3. **Analyzing Option 2**:
- This option states that "blood does not have any important role in oxygen transport."
- This is false, as blood plays a crucial role in transporting oxygen from the lungs to the tissues.

**Hint**: Consider the primary functions of blood in the body, especially regarding gas transport.

4. **Analyzing Option 3**:
- The statement claims that "it respires anaerobically."
- This is also incorrect in the context of oxygen transport, as aerobic respiration requires oxygen.

**Hint**: Recall the difference between aerobic and anaerobic respiration and their requirements.

5. **Analyzing Option 4**:
- The statement says that "oxygen from the air will combine with the hemoglobin of the RBCs."
- This is accurate because oxygen binds to hemoglobin in red blood cells after diffusing from the alveoli in the lungs.

**Hint**: Think about the process of gas exchange in the lungs and how oxygen is transported in the blood.

6. **Conclusion**:
- After analyzing all options, the most accurate statement about respiration is option 4: "Oxygen from the air will combine with the hemoglobin of the RBCs."

### Final Answer:
**The correct answer is Option 4: "Oxygen from the air will combine with the hemoglobin of the RBCs."**