The external intercostals elevate the rib cage during .

A. neither inspiration nor expiration
B. inspirationexpiration
C. both expiration and inspiration

The external intercostals elevate the rib cage during inspiration.

The respiratory muscles have a mechanical function, that of expanding the rib cage to favor the entry of air.

The external intercostals are occupying the intercostal spaces and are oriented downwards and backwards, leaving the last part of the intercostal space free.

Therefore, we can conclude that the external intercostals elevate the rib cage during inspiration.

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Inspiration is your answer.

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name and explain one of the event that occurs during meiosis that increases the variation in offspring even more than simple reproduction?

1. efficient use of space

2. elimination of groundwater contamination

3. energy generation

4. lower carbon footprint