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Structure of blood vessels:
Arteries: carry blood away from the heart and into arterioles
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Blood vessels and
their function

Artery Structure related to function:
The function of arteries is to transport blood rapidly under high pressure from the heart to the tissues
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They also control the
flow of blood between the two
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lumen of the arteriole
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structure (from the outside inwards):
control the volume of blood passing through them
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es from both within and outside
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The elastic Vein structure related to function:
of blood
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It then reVeins transport blood slowly, under low pressure, rom
coils when the heart relaxes (diastole) in the same way as the capillaries in tissues to the heart
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This action helps to maintain
stretching and recoiling
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tion cannot control the flow of blood to the tissues
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Overall thickness of the wall is great: this also resits the
Elastic layer is relatively thin: the low pressure of blood
Lumen: not a layer but the central cavity of the blood
vessels bursting under pressure
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There are no valves: (except in arteries leaving the heart) sure is too low to create a recoil action
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It therefore
thick wall because the pressure within the veins is too
tends not to flow backwards
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Also allows them to
be flattened easily, aiding the flow of blood within them
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There are valves at intervals throughout: because the
pressure is so low, blood could potentially flow backwards
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The valves
ensure that this pressure directs the blood towards the
heart only
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Tissue fluids supplies all of
Capillary structure related to function:
these substances to the tissues
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Tissue fluid is thereterials such as oxygen, CO2 and glucose between
fore the means by which materials are exchanged between
the blood and the cells of the body
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blood in capillaries is much slower to allo

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