OCR GCSE Biology Practice Exam 2025 – Comprehensive All-in-One Guide to Exam Success

Question: 1 / 1090

How are arteries specifically adapted to carry blood under pressure?

They have thin walls

They contain valves to prevent backflow

They have strong, thick walls with elastic fibers

Arteries are specifically adapted to carry blood under pressure due to their strong, thick walls that contain elastic fibers. The high pressure of blood pumped from the heart requires arteries to withstand significant force without bursting. The thick muscular layer allows them to resist and regulate the pressure exerted by the flowing blood. Additionally, the elastic fibers enable the arteries to stretch and recoil with each heartbeat, helping to maintain a consistent pressure and facilitate blood flow. This combination of strength and elasticity is crucial for the arteries to effectively carry blood throughout the body, especially during the contraction of the heart.

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They have larger lumens than veins

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