What is the diaphragm?

A. Membrane that surrounds the lungs
B. Partition that divides the abdominal and thoracic cavities
C. Partition that divides the nostrils
D. Membrane that lines the chest cavity



Answer :

Final answer:

The diaphragm is a muscle that separates the thoracic and abdominal cavities, crucial for breathing.


Explanation:

The diaphragm is a dome-shaped muscle that separates the thoracic cavity from the abdominal cavity. It plays a vital role in breathing by contracting and expanding, allowing air to enter and exit the lungs.


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