Question

How do the internal and external intercostal muscles differ?

Answer 1

The external intercostal muscles are responsible for forced and quiet inhalation. ... The internal intercostal muscles areresponsible for forced exhalation. They depress the ribs and decrease space in the chest cavity. They originate from ribs two through 12, with insertion from ribs one to 11.

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Answer 2

Question:

Role of diaphragm and intercostal muscles in breathing.

Answer:

As we know that the diaphragm is attached to the base of the sternum, the lower parts of the rib cage, and the spine.

As the diaphragm contracts, it increases the length and diameter of the chest cavity and thus expands the lungs.

Therefore the intercostal muscles help move the rib cage and thus assist in breathing.

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