Question

explain process of expiration

Answer 1

Two lungs are the primary organs of the respiratory system............The process of breathing is divided into two distinct phases inspiration and expiration .During Inspiration the diaphragm contracts and pulls downward while the muscles between the ribs contract and pull upward.


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Answer 2

Exhalation (or expiration) is the flow of the breath out of an organism. In humans it is the movement of air from the lungs out of the airways, to the external environment during breathing.
This happens due to elastic properties of the lungs, as well as the internal intercostal muscles which lower the rib cage and decrease thoracic volume. As the thoracic diaphragm relaxes during exhalation it causes the tissue it has depressed to rise superiorly and put pressure on the lungs to expel the air. During forced exhalation, as when blowing out a candle, expiratory muscles including the abdominal muscles and internal intercostal muscles generate abdominal and thoracic pressure, which forces air out of the lungs.



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