| Respiratory
System |
Air
enters through the nose and mouth and passes through the pharynx
into the larynx (where the vocal cords
are located). Food entering the mouth also passes through the
pharynx. It is prevented from entering the lungs by the epiglottis,
which folds down over the larynx when swallowing.
From the larynx air enters the trachea which
splits into the right and left main bronchi
which enter the right and left lungs. The bronchi keep
branching into many smaller airways, the smallest of which
is the bronchiole (not shown). From the bronchioles branch
the alveoli or "air sacs".
The diaphragm is an important muscle used for
breathing.
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