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Capillaries-one cell thick, minimal diffusion distanceveins-wise lumen, many elastic fibres, valves presentarteries-thick muscular layer to withstand BP

Arteries - carry blood at high pressure away from the heart. Their narrow lumen and thick, muscular wall allows them to do this effectively. The elastic, muscular wall allows for expansion and relaxation ...

Worth four marks
Enzymes are biological catalysts which are used in reactions. A reaction will typically involve an enzyme and a substrate. Enzymes a...

During photosynthesis, green plants use carbon dioxyde and water, and with light energy convert them to glucose and oxygen. There are two phases of this process, the light-dependent phase which needs the ...