The large arteries close to the heart have a thick elastic layer in their walls to:
Correct answer: D. Prevent too much pressure exerted on their walls
- A. Prevent collapse of these blood vessels
- B. Reduce friction within these blood vessels
- C. Anchor these vessels with surrounding tissues
- D. Prevent too much pressure exerted on their walls
Explanation
The thick elastic layer in the walls of large arteries, such as the aorta, is crucial for maintaining blood pressure and ensuring efficient blood flow. This elasticity allows the arteries to stretch and accommodate the surge of blood with each heartbeat, then recoil to help push the blood forward. This action prevents excessive pressure from being exerted on the arterial walls, which could otherwise lead to damage or rupture.
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About Blood Vessels
Blood vessels include arteries, arterioles, capillaries, venules and veins, whose wall thickness, elasticity, lumen size and valves suit their roles in circulation. Questions compare pressure and blood flow in each vessel and distinguish pulmonary vessels, which carry blood to and from the lungs, from systemic vessels.
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