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HELP PLEASE!

The ___________ is the main breathing muscle that expands the lungs when it contracts and forces air into the lungs.

Larynx


Trachea


Lungs


Diaphragm

2 Answers

3 votes
The Trachea is the main breathing muscle
User Nick Farina
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The diaphragm is the right answer!

"Diaphragm. The diaphragm is the major muscle responsible for breathing. It is a thin, dome-shaped muscle that separates the abdominal cavity from the thoracic cavity. During inhalation, the diaphragm contracts, so that its centre moves caudally (downward) and its edges move rostrally (upward)."
User Grigori Kochanov
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