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Blood vessels
Arteries: Carry blood away from the heart

Arterioles: Control blood flow from arteries to capillaries

Capillaries: Link arterioles to veins

Veins: Carry blood towards the heart

Structure of blood vessels:

Tough outer layer ­ resists pressure
Muscle layer ­ can contract and control the flow of blood

Page 2

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Thick muscle layer ­ control the flow of blood
Thick elastic layer ­ smooth surges from the heart
No valves


Thicker muscle layer than arteries
Thinner elastic layer than arteries
No valves


Thin muscle layer
Thin elastic layer


No muscle
No elastic
No valves
Thin layer…


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