- A External intercostal muscle
- B Internal intercostal muscle
- C Diaphragm
- D Vertebral column
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Answer:
C
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The diaphragm is the most important muscular structure in the respiratory system of humans. It separates the thoracic and abdominal cavities and contracts during inspiration, leading to an increase in thoracic volume. Conversely, during expiration, it relaxes causing a decrease in thoracic volume. This change in thoracic volume leads to the movement of air into and out of the lungs, allowing for breathing to occur.
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