Medical MCQ-Which of the following best characterizes alveolar ventilation and blood flow at the base, compared with the apex, of the lungs of a healthy standing person?

Which of the following best characterizes alveolar ventilation and blood flow at the base, compared with the apex, of the lungs of a healthy standing person?

Ventilation - Higher, Blood flow - Higher, V/Q ratio - Lower

Ventilation - Lower, Blood flow - Higher, V/Q ratio - Higher

Ventilation - Lower, Blood flow - Lower, V/Q ratio - Lower

Ventilation - Higher, Blood flow - Lower, V/Q ratio - Higher

Question Category:

Physiology

Correct Answer:

Ventilation - Higher, Blood flow - Higher, V/Q ratio - Lower

Description:

Ans. A. Ventilation - Higher, Blood flow - Higher, V/Q ratio - LowerAt the base, both airflow and blood flow are higher; however, blood flow exceeds airflow at the base, which results in a low V.A/Q. ratio. At the apex, blood flow and airflow are lower than at the base, but airflow is greater than blood flow, which leads to a high V.A/Q..

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