Large veins have ________ to prevent the backflow of blood.
A) tunics
B) sphincters
C) valves
D) shunts

Name: Large veins have ________ to prevent the backflow of blood. A) tunics B) sphincters C) valves D) shunts
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Large veins have valves that prevent the backflow of blood. These valves act like small doors that allow blood to flow in only one direction, towards the heart. This is important for maintaining proper blood flow and preventing blood from pooling in the lower extremities.

Large Veins Have ________ to Prevent the Backflow of Blood