Expiration involves the relaxation of external intercostal muscles and contraction of internal intercostal muscles, moving the ribs down and inwards, and diaphragm relaxation, decreasing thoracic volume and increasing pressure to expel air.
A expiração envolve o relaxamento dos músculos intercostais externos e a contração dos músculos intercostais internos, movendo as costelas para baixo e para dentro, e o relaxamento do diafragma, diminuindo o volume torácico e aumentando a pressão para expelir o ar.
| Front | What are the stages of expiration |
|---|---|
| Back | External intercostal muscles relax Internal intercostal muscles contract Ribs move down and inwards decreasing thorax pressure Diaphragm relaxed so the volume of thorax decreased Decreased volume= increased pressure Pulmonary pressure> atmospheric pressure |
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