Mixing of venous blood with arterial blood (a right-to-left shunt) occurs normally because of which of the following?
I.congenital cardiac defects
II.bronchial venous drainage
III.thebesian venous drainage in the heart

Question

Quizplus · Accepted Answer

Mixing of venous blood with arterial blood occurs through bronchial venous drainage and Thebesian venous drainage in the heart, both of which are normal physiological processes. Congenital cardiac defects may also cause a right-to-left shunt, but this is not a normal process. Therefore, options I and III are incorrect, while option II is correct. The correct answer is option B.

Mixing of Venous Blood with Arterial Blood (A Right-To-Left Shunt)