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Esme Nias Arteries, veins and capillaries 25.1.16

Circulatory system

Arteries:

Carry blood away from heart
Thick, multilayered walls
Walls are capable of stretching to
accommodate the `pulse' of
blood
Capable of expanding and
contracting to change and
maintain blood pressure
No valves
Blood inside is high in oxygen and
low…

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Esme Nias Arteries, veins and capillaries 25.1.16


Vessels larger than capillaries but smaller (narrower and thinner walls) than veins


Veins:

Larger inside diameter
compared to arteries
Take blood towards heart
Thinner, less muscular walls
than arteries, but still 3
layers
No stretching or contracting
of walls except by external
valves…

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Esme Nias Arteries, veins and capillaries 25.1.16

Heart pumps towards head via peristalsis

Closed systems:

Blood stays entirely in vessels
Tissue fluid leaves vessels to bathe tissues and cells
Blood can be pumped at higher pressure so higher flow
= waste can be removed quicker and the supply is quicker…

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