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Pressure Intercostal Muscles Thorax Decreased Stages Expiration External

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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