Question

which muscular part of the body present in thel chest cavity helps air to be breathed in and out?

Answer 1

The muscles of respiration are those muscles that contribute to inhalation and exhalation, by aiding in the expansion and contraction of the thoracic cavity. The diaphragm and, to a lesser extent, the intercostal muscles drive respiration during quiet breathing. Additional 'accessory muscles of respiration' are typically only used under conditions of high metabolic demand (e.g. exercise) or respiratory dysfunction (e.g. an asthma attack).

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Answer 2

The muscular part of the body which is present in the chest cavity which helps in breathing is one and only the DIAPHRAGM.
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