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Arrange the following terms regarding process of respiration in chronological order of its decreasing volume of air I. Expiratory reserve volume II. Vital capacity III. Tidal volume IV. Residual volume

1. \( I I \rightarrow I V \rightarrow I \rightarrow I I I \)
2. \( I I \rightarrow I V \rightarrow I I I \rightarrow I \)
3. \( I \rightarrow I V \rightarrow I I I \rightarrow I I \)
4. \( I V \rightarrow I \rightarrow I I I \rightarrow I \)

Correct answer: \( I V \rightarrow I \rightarrow I I I \rightarrow I \)

Solution

Residual volume is the smallest because it is the air left after forceful expiration. Expiratory reserve volume is next, followed by tidal volume, while vital capacity is the largest among these because it combines several volumes.

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