Describe the structure of an artery and a vein. Explain how their stru

1.	Describe the structure of an artery and a vein. Explain how their structure helps in their functioning.
Answer» Structure of Artery: • Wall is thick and elastic. • Lumen is narrow. • Valves are absent. • Endothe liai cells of tunica are bore elongated. Tunica media is more inuscular and tunica externa is less developed. Structure of vein: • Wall is thin and less elastic. • Lumen is wide. • Valves are present. • Endothelial cells of tunica arc lcss elongated. Tunica media is less muscular and tunica externa morc developed. Function of artery: Arteries do not collapse due to the fast flow of blood under pressure as they have thick walls. Function of vein : In veins the blood flows smoothly because of large lumen and the valves prevent backward flow of blood.

Describe the structure of an artery and a vein. Explain how their structure helps in their functioning.

Answer»

Structure of Artery:

• Wall is thick and elastic.

• Lumen is narrow.

• Valves are absent.

• Endothe liai cells of tunica are bore elongated. Tunica media is more inuscular and tunica externa is less developed.

Structure of vein:

• Wall is thin and less elastic.

• Lumen is wide.

• Valves are present.

• Endothelial cells of tunica arc lcss elongated. Tunica media is less muscular and tunica externa morc developed.

Function of artery: Arteries do not collapse due to the fast flow of blood under pressure as they have thick walls.

Function of vein : In veins the blood flows smoothly because of large lumen and the valves prevent backward flow of blood.