Answer :
Final answer:
The alveolar ventilation rate is the best index of effective ventilation because it measures the exchange of oxygen and carbon dioxide between the lungs and the blood. By adjusting the respiratory rate and tidal volume, alveolar ventilation can be kept constant. This ensures proper oxygenation and prevents carbon dioxide buildup.
Explanation:
The alveolar ventilation rate refers to the amount of air that reaches the alveoli (tiny air sacs in the lungs) per minute. It is considered the best index of effective ventilation because it measures the actual exchange of oxygen and carbon dioxide between the lungs and the blood. By increasing the respiratory rate while decreasing the tidal volume (the volume of air per breath), alveolar ventilation can be kept constant even though the amount of air in each breath is reduced. This ensures that carbon dioxide is effectively removed from the alveoli, preventing buildup and maintaining proper oxygenation.
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