Please refer to the following art to answer the following questions.
-The one-way flow of blood in veins is maintained by ________.
A)blood pressure
B)muscles pressing against the veins
C)their thick walls
D)valves

Question

Please refer to the following art to answer the following questions. 
-The one-way flow of blood in veins is maintained by ________.
A)blood pressure 
B)muscles pressing against the veins 
C)their thick walls 
D)valves

Quizplus · Accepted Answer

Valves in veins prevent the backflow of blood, ensuring it moves in one direction towards the heart.

Please Refer to the Following Art to Answer the Following