Question

Assertion: Veins have thin walls to collect blood from different organs.
Reason: Blood in veins are not under pressure

Answer 1

Answer:

Assertion and Reason both are correct

Explanation:

veins are thin walled blood vessels which carry deoxygenated blood from all parts of the body back to the heart. They do not need thick walls because blood flowing through them is no longer under high pressure. Instead, they have valves which prevent the backflow of blood.

Answer 2

Both assertion and reason are correct with respect to veins.

• Heart supplies and receives blood to and from the body through arteries and veins respectively.
• Since blood pumps blood to different organs through arteries, which requires them to be under pressure and hence they are thick walled.
• On the other hand, veins transport blood from organs to heart, which does not require pressure, making them thin walled.
• Veins also have valves to ensure single direction of blood flow.