BI-1145
Arteries, veins and capillaries
Biology · Secondary 3 · Medium · Arteries, veins and capillaries
Which statement correctly describes capillaries in the human circulatory system?
- They have one‑cell‑thick walls to allow rapid diffusion of substances.
- They have thick muscular walls to withstand very high pressure.
- They contain many valves to prevent backflow of blood.
- They carry only deoxygenated blood away from the heart.
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