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Respiratory System (Organs of Respiratory Tract & location (upper &…
Respiratory System
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Breathing Mechanism
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Out
when pressure inside the lungs is greater than the atmospheric pressure, the air moves
In
when pressure inside the lungs is lesser than the atmospheric pressure, the air moves
during inspiration the diaphragm moves down, the ribs move up,sternum moves forward, which causes the size of the chest cavity to increase,and pressure decreases.
Scalenes, Sternocleidomastoid, and Pectoralis Minor Muscle
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during expiration diaphragm and ribs muscles relax,and size of chest cavity decrease,and pressure increases.
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Major functions
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passageways to lungs purify, warm , and humidify the incoming air.
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