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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
Elastic…

Page 2

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

Arterioles:

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

Veins:

Thin muscle layer
Thin elastic layer
Valves

Capillaries

No muscle
No elastic
No valves
Thin layer…

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