In birds, the parabronchi capillaries are oriented at right angles to the parabronchi. Which of the following is the gas exchange method that describes this process?

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Crosscurrent exchange is the method where the blood flow across the gas exchange surface (in this case, the parabronchi capillaries) is at right angles to the airflow in the parabronchi, allowing for efficient gas exchange in birds.

In Birds, the Parabronchi Capillaries Are Oriented at Right Angles