The nurse uses a visual aid to show the mechanics of inhaling which correctly illustrates:
a. the diaphragm moves down.
b. the negative pressure of the lung converts to positive pressure.
c. muscles contract, pulling the rib cage down.
d. bronchi enlarge.
A
On inspiration, the diaphragm moves down, increasing the area of negative pressure, muscles pull the rib cage up, and the positive-pressure room air flows into the negative-pressure lungs.
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