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19.4

Across
Momentarily stop breathing while sleeping
Air sacs in the lungs
Regulates the depth of breathing
Stimulates inspiratory muscles.
What controls breathing
Down
phagocytize airborne agents, including bacteria
Breathing that lowers the C02 concentration
Amount of gas and is proportional to its concentration
Small branch of a bronchus in the lung
Separates the thoracic and abdominal cavities