The primary muscle of ventilation is?

The primary muscle of ventilation is called Diaphragm. It is a thin, dome-shaped muscle that separates the abdominal cavity from the thoracic cavity.

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The soviet union beat the us to the first successful launch, with the october 4, 1957, orbiting of sputnik 1, and later beat the us to have the first human in earth orbit, yuri gagarin, on april 12, 1961. the "race" peaked with the july 20, 1969, us landing of the first humans on the moon with apollo 11

The sun is 432,170 mi big!