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Gas Exchange - Humans (parts of respiratory system (Larynx - a box shaped…
Gas Exchange - Humans
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Ventilation of Lungs
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For air to enter the lungs, the pressure inside lungs must be below atmospheric pressure
Expiration (Exhalation)
normal expiration = passive process - lung tissue is elastic so recoils to regain shape - recoil = major part in pushing air out of lungs
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Inspiration (Inhalation)
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1 - the external intercostal muscles contract pulling the ribs upwards and outer plural membrane outwards
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Specialised cells
goblet cells - secrete mucus - traps dust, bacteria etc.
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