Expiration occurs due to
Relaxation of diaphragm and external intercostal muscle
Contraction of internal intercostal muscles and diaphragm
Relaxation of abdominal and internal intercostal muscles
Contraction of diaphragm and relaxation of abdominal muscles
Mechanism of Expiration -
This leads to an increase in intra-pulmonary pressure to slightly above the atmospheric pressure causing the expulsion of air from the lungs.
- wherein
This causes expiration
Correct option is 1