- diaphragm contracts (moves downwards / flattens) - external intercostal muscles contract - rib cage moves upwards and outwards - increased volume of thoracic cavity - decreased pressure of thoracic cavity - pressure of thoracic cavity < atmospheric pressure (of rest of body) - so air rushes into lungs / thoracic cavity through nose / mouth

- external intercostal muscles relax - rib cage moves downwards and inwards - diaphragm stays convex / relaxes: - decreased volume of thoracic cavity - increased pressure of thoracic cavity - pressure of thoracic cavity > atmospheric pressure (of rest of body) - so air rushes out of lungs

Ventilation Flashcards by Pendar Ahmadvazir

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Inhalation steps

diaphragm contracts (moves downwards / flattens)
external intercostal muscles contract
rib cage moves upwards and outwards
increased volume of thoracic cavity
decreased pressure of thoracic cavity
pressure of thoracic cavity < atmospheric pressure (of rest of body)
so air rushes into lungs / thoracic cavity through nose / mouth

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Exhalation steps

external intercostal muscles relax
rib cage moves downwards and inwards
diaphragm stays convex / relaxes:
decreased volume of thoracic cavity
increased pressure of thoracic cavity
pressure of thoracic cavity > atmospheric pressure (of rest of body)
so air rushes out of lungs

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Ventilation Flashcards

(2 cards)