What is the main reason for the difference between artery and vein walls?
Answer and explanation
Correct answer: Difference in blood pressure
The governing concept is adaptation of blood-vessel structure to pressure. Arteries receive blood directly from the ventricles, so blood flows through them at relatively high and pulsating pressure; their walls are therefore thick, muscular and elastic. Veins return blood at lower pressure and have thinner walls, wider lumens and valves to prevent backflow. Hence option A gives the main reason. Blood colour is not a permanent artery–vein distinction, and the other options are irrelevant.
Frequently asked questions
What is the correct answer to this question?
Difference in blood pressure
Why is this the correct answer?
The governing concept is adaptation of blood-vessel structure to pressure. Arteries receive blood directly from the ventricles, so blood flows through them at relatively high and pulsating pressure; their walls are therefore thick, muscular and elastic. Veins return blood at lower pressure and have thinner walls, wider lumens and valves to prevent backflow. Hence option A gives the main reason. Blood colour is not a permanent artery–vein distinction, and the other options are irrelevant.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: World of Living. Topic: Life Processes.
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