Which of the following respiratory volume or capacity can differentiata live born or dead born child ?

Options

A. Tidal volume
B. Residual volume
C. Inspiratory reserve volume
D. Vital capacity

Answer

To determine which respiratory volume or capacity can differentiate a live-born child from a dead-born child, we need to analyze the concept of residual volume in the context of neonatal respiration.

### Step-by-Step Solution:

1. **Understanding Residual Volume**:
- Residual volume (RV) is the amount of air that remains in the lungs after a person has exhaled completely. It is important because it prevents the lungs from collapsing and ensures that gas exchange can continue even between breaths.

2. **Respiratory Changes at Birth**:
- When a baby is born, the first cry indicates that the lungs have opened up and air has entered. This is crucial because it signifies the initiation of independent respiration.

3. **Differentiating Live-born from Dead-born**:
- In a live-born child, the act of crying leads to the introduction of air into the lungs, resulting in a measurable residual volume. This air remains in the lungs after the first breath and subsequent breaths.
- In contrast, a dead-born child does not take a breath, and thus, the lungs remain filled with fluid (amniotic fluid) rather than air. Consequently, there is little to no residual volume in the lungs of a dead-born child.

4. **Conclusion**:
- The presence of residual volume in the lungs can be used to differentiate a live-born child from a dead-born child. A live-born child will have a measurable residual volume due to the intake of air, while a dead-born child will not.

### Final Answer:
The respiratory volume that can differentiate a live-born child from a dead-born child is **Residual Volume**.

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