CBSE Class 10 Science
Question 24 of 45
Solved 2024 Sample Question Paper CBSE Class 10 Science — Question 4
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Question Question 23(b)
Why do arteries have thick and elastic walls whereas veins have valves?
The blood emerges from the heart under high pressure and flows through arteries. The walls of arteries are thick and elastic to bear the pressure. The veins have valves to avoid back-flow of blood and ensure unidirectional flow of blood.