Why do arteries have thick, elastic walls in human body?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is Option 1: To accommodate high blood pressure.
Explanation:
During the blood circulation process in the human body, arteries carry oxygenated blood from the heart to various organs of the body. The primary scientific reasons why their walls are thick and elastic are as follows:
• High Pressure: When the heart beats, it pumps blood into the arteries with very high pressure. If the walls of the arteries were thin, they would be unable to withstand this intense pressure and could rupture.
• Elasticity: The elastic tissues present in the arteries help them expand with each heartbeat and then recoil to their original shape, thereby ensuring a continuous and smooth flow of blood.
Differences between Arteries and Veins:
Feature Arteries Veins
Walls Thick and elastic. Thin and less elastic.
Pressure Blood flows under high pressure. Blood flows under low pressure.
Type of Blood Primarily pure (O2-rich) blood. Primarily impure (CO2-rich) blood.
Valves Do not contain valves. Contain valves to ensure blood flows in only one direction.
Exceptions:
• Pulmonary Artery: This is the only artery that carries impure (deoxygenated) blood from the heart to the lungs.
• Pulmonary Vein: This is the only vein that carries pure (oxygenated) blood from the lungs to the heart.
Potential Question for Upcoming Exams:
Question: In which type of blood vessel does blood flow under the lowest pressure?
Answer: Veins. Question: What is the largest artery in the body?
Answer: The Aorta.
Question: What color do arteries typically appear?
Answer: Bright red (due to the presence of oxygen).