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Subjects
Science CBSE
Class 7
Transportation in animals and plants
Textbook questions II
7.
Very short answer I
Exercise condition:
2
m.
Veins have valves which allow blood to flow only in one direction. Arteries do not have valves. Yet the blood flows in one direction only. Can you explain why?
(Choose all possible answers)
Low pressure in arteries
High pressure in arteries
Stiffness of artery walls
Elasticity of artery walls
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