Extensions of the _____ of veins form valves that help prevent the backflow of blood.
A) tunica interna (intima)
B) tunica media
C) tunica externa

Question

Quizplus · Accepted Answer

Extensions of the tunica interna (intima) of veins form valves that help prevent the backflow of blood. These valves are crucial for ensuring unidirectional blood flow back to the heart, especially in the limbs.

Extensions of the _____ of Veins Form Valves That Help