blood vessels

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Ramen

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arteries have corrugated epithelial cells, elastic fibres and high blood pressure
how is high blood pressure maintained in arteries? 
elastic fibres stretch and recoil
stretching - volume increases, pressure decreases
recoiling - volume decreases, pressure increases
adaptation of vein: semilunar valve - situated between muscles so it's squeezed
function of collagen fibres: to withstand the blood pressure
all arteries have collagen fibres, elastic fibres and smooth muscles
venules have no elastic fibres or smooth muscle

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blood vessels

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