Ncert Exercises & Solutions

Mark the correct pair of muscles involved in the normal breathing in
humans.

1. External and internal intercostal muscles
2. Diaphragm and abdominal muscles
3. Diaphragm and external intercostal muscles
4. Diaphragm and intercostal muscles

. (c) The diaphragm and a specialised set of muscles, called external muscles present between the ribs are involved in the norma lbreathing in humans. They are involved in generating pressure gradient of air between the lungs and the atmosphere, so as to faeiliate the intake of air.

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