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This lesson covers the structure and function of blood vessels (arteries, arterioles, capillaries, venules, and veins) and the composition of blood as required by the Edexcel A-Level Biology specification (9BI0). You need to understand how the structure of each vessel type relates to its function, and the roles of the different blood components.
The circulatory system uses three main types of blood vessel, each with a structure precisely adapted to its function.
Arteries carry blood away from the heart under high pressure.
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