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List 5 types of blood vessels
Arteries
Arterioles
Veins
Venules
Capillaries
Structure and adaptations of arteries
Thick walls withstand the high pressure of blood. Rings of muscle can narrow and widen the artery to control blood flow.
Elastic walls expand and relax as blood is forced out of the heart (Pulse)
Structure and adaptations of veins
Valves prevent the back flow of blood
Large diameter and thin walls reduce resistance to the flow of blood
Nearby muscles squeeze the veins and help push blood back towards the heart
Structure and adaptations of Capillaries
One cell thick for fast diffusion
Function of arterioles
N/A
Function of Venules
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