BI-1154
Arteries, veins and capillaries
Biology · Secondary 3 · Medium · Arteries, veins and capillaries
A capillary has very thin walls and a large total cross‑sectional area. How do these features help it carry out its function?
- They increase blood pressure so blood flows faster to the heart.
- They allow rapid diffusion of substances between blood and tissues.
- They prevent any exchange of materials with surrounding cells.
- They make blood flow turbulent to mix oxygen and carbon dioxide.
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