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Summary Blood vessels and tissue fluid

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2020/2021 Written for academic year
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OCR
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Module 3
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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 the waste products of this process are removed via the lymphatic system. Good quality notes, including diagrams.

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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

Document information

Study Level
A/AS Level
Subject
Biology
Uploaded on
February 5, 2021
File latest updated on
February 5, 2021
Number of pages
3
Written in
2020/2021
Type
Summary
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Browse related subjects

Subjects

  • biology
  • blood
  • circulatory system
  • lymph
  • lymphatic system
  • tissue fluid
  • capillary
  • vein
  • artery
  • arteriole
  • venule

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