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15.Body Fluids and Circulations
medium
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
Solution
(c) The valves in veins prevents the backflow of blood whereas in arteries the backflow is prevented by the peristaltic contraction of the arteries.
Standard 11
Biology
