AQA AS Biology

Revision Notes

3.5.6 Blood Vessels

Arteries, Arterioles & Veins

  • Arteries, veins and capillaries all have varying structural features

Blood vessels structure & function table

4. Blood vessels structure & function table, downloadable AS & A Level Biology revision notes

Worked example: Blood vessel features

Blood vessels structure & function WE table, downloadable AS & A Level Biology revision notes

The correct answer is B.

This is because elastic arteries do not contain many smooth muscle fibres and are not able to perform vasoconstriction or vasodilation. In contrast, muscular arteries contain much more smooth muscle. Veins have large amounts of collagen for strength and keeping their shape, while capillaries are only one-cell thick and so do not contain any elastic, smooth muscle or collagen.

Exam Tip

For “Explain” questions, remember to pair a description of a structural feature to an explanation of how it helps the blood vessel to function. For example, “Capillaries are one-cell thick, which enables quick and efficient diffusion of substances.”

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