Science

Why do arteries have thick and elastic walls whereas veins have valves?

Circulatory System

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Answer

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.

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A	1.6
B	1.8
C	1.5

Science

Why do arteries have thick and elastic walls whereas veins have valves?

Circulatory System

Answer

Related Questions

State the post-fertilisation changes that lead to fruit formation in plants.

What is the purpose of making urine in the human body? Name the organs that stores and releases the urine.

A piece of wire of resistance R is cut into three equal parts. These parts are then connected in parallel. If the equivalent resistance of this parallel combination is R1, what is the value of the ratio R1 : R?

A piece of wire of resistance R is cut into three equal parts. These parts are then connected in parallel. If the equivalent resistance of this parallel combination is R₁, what is the value of the ratio R₁ : R?