Write down the roles of intercostal muscles in respiration.
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intercostal muscles are many different groups of muscles that run between the ribs and help form and move the chest wall.the intercostal muscles are mainly involved in the mechanical aspect of breathing by helping expand and shrink the size of the chest cavity.they also help to solidify the thoracic region and protect the lungs.

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Explanation:

internal intercostal muscles assist in forced expiration by depressing the ribs,

external intercostals raise the rib cage, assisting in inhalation.