Question
Question: Valves are necessary in veins but not in arteries because...
Valves are necessary in veins but not in arteries because
A
Blood flows with greater force in veins
B
Blood in veins flows without jerk
C
Blood from heart may not be pushed back into veins
D
Pressure in veins is low, which can flow the blood
Answer
Blood from heart may not be pushed back into veins