Airway resistance
A) is normally the primary factor determining the amount of flow into/out of the lungs.
B) is increased when the diameter of the airways becomes reduced.
C) when elevated requires an increased pressure gradient between the lungs and atmosphere through vigorous respiratory efforts to move even normal volumes of air into and out of the lungs.
D) both (b) and (c) above.
E) all of these answers.

Question

Quizplus · Accepted Answer

Airway resistance is primarily determined by the diameter of the airways, and when the diameter is reduced, resistance increases. This requires an increased pressure gradient between the lungs and atmosphere, which can only be achieved through vigorous respiratory efforts. Therefore, both options (b) and (c) are correct, making option D the best choice. Option A is incorrect because airway resistance is not always the primary factor determining the amount of flow into/out of the lungs. Other factors like lung compliance and respiratory muscle function may also play a role. Option E is incorrect as it includes an incorrect statement (Option A).

Airway Resistance