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What is the functional importance of the decrease in cartilage and increase in smooth muscle in the lower respiratory passageways?
Updated: 11/12/2022
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∙ 9y agoBest Answer
The smooth muscle in the walls of the bronchioles is very sensitive to the concentration of carbon dioxide. A rising level of CO2 causes the bronchioles to dilate. This lowers the resistance in the airways and thus increases the flow of air in and out.
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∙ 9y agoThis answer is:
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