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Summary Blood vessels and tissue fluid $3.87
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Summary Blood vessels and tissue fluid

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This summary includes the structures and functions of the different types of blood cells in the human body. It includes the differences between each of the blood vessels, which is a common comparison question in A level biology. There is also an explanation of the formation of tissue fluid and how ...

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  • February 5, 2021
  • February 5, 2021
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  • 2020/2021
  • Summary
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BLOOD VESSELS

ARTERIES:
● Carry the blood away from the heart
● high blood pressure
● thick walls
● Smaller lumen than veins
● lots of elastic tissue to smooth the flow of the blood
● lots of smooth muscle
● lined with smooth endothelium to reduce friction

ARTERIOLES
● Branch off of arteries
● thinner walls
● less muscular walls
● feed the blood to the capillaries

CAPILLARIES
● Smallest blood vessel
● site of metabolic exchange
● walls are only one cell thick for fast exchange
● leaky walls (holes/ pores in the walls)

VENULES
● Larger than capillaries
● smaller than arteries and veins

VEINS
● Carry the blood into the heart
● large lumen
● thin walled as the blood pressure is low
● little elastic tissue
● contain valves to prevent backflow of the blood

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