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Blood Vessels (VEINS (Take blood back to the heart, Capillaries join up to…
Blood Vessels
VEINS
Take blood back to the heart
Capillaries join up to form VEINS
Low pressure of blood
Walls don't need to be thick
Bigger LUMEN (middle)
Valves to keep the blood flowing
Largest vein is the VENA CAVA
ARTERIES
Carry blood under-pressure
Walls are strong and elastic
Elastic fibres allow arteries to expand
Walls are thick
Thick layers of muscle
Largest artery is the AORTA
CAPILLARIES
Really small
Arteries branch into capillaries
Carry blood close to the cell
Permeable walls
Supply food and oxygen
Walls are 1 cell thick
Increases the rate of diffusion
FUNCTION
ARTERIES
Carry the blood AWAY from the heart
CAPILLARIES
Exchange materials at the TISSUES
VEINS
Carry blood TO the heart