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Defenses of the respiratory tract
Mucus- entraps microorganisms.
Cilia- push microorganisms and mucus up and out of respiratory tract.
Cough reflex.
Relaxed state
Diaphragm and intercostal muscles relaxed
Inspiration (inhale)
Diaphragm contracts pulling muscle down. Intercostal muscle contract evelating chest wall expanding volume of chest, lowering pressure in lungs pulling air
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