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When we inhale or breathe in the diaphragm contracts ( flattens) and the external intercostal muscles contract moving the rib cage up wards and outwards increasing the volume of the chest cavity, causing air to rush in

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When we exhale or breathe out the diaphragm relaxes, returning to a dome shape. The internal intercostal muscles contract moving the rib cage downwards and inwards, reducing the volume of the chest cavity, causing air to rush out.

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How much air that comes in is called a tidal volume

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How much air that comes in is called a tidal volume

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During inspiration, the diaphragm contracts and pulls downward while the muscles between the ribs contract and pull upward.

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during inspiration the diaphragm contracts and pulls downward

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you breathe in oxygen and breathe out carbon dioxide

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you breathe in oxygen and breathe out carbon dioxide

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inspiration: the diagram contracts (flattens) and the external Intercostal muscles contract moving the rib cage up and outwards,

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When we inhale or breathe inthe diaphragm contracts and the external intercostal muscles contract moving the rib cage up wards and downwards increasing the volume of the chest cavity, causing air to rush in

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when the diaphragm contracts it moves down which allows the chest cavity to enlarge.

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Inspiration and expiration can happen from the nasal cavity and oral cavity

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Inspiration - breathe in