GCSE Combined Science (AQA)

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Blood Vessels

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Organisation Animal Tissues, Organs and Organ Systems

Blood Vessels

3:31 Circulatory and Respiratory System
Spec 4.2.2.2
Previous The Liver & Bile Next Heart Anatomy
  • Blood is circulated around the body through blood vessels, collectively known as the circulatory system.
  • There are three main types of blood vessels: arteries, veins, and capillaries.
  • Arteries carry oxygen-rich blood from the heart to various organs and tissues, functioning under high pressure with thick walls composed of muscle and elastic tissue.
  • The narrow lumen in arteries helps maintain high blood pressure.
  • Veins return oxygen-depleted blood back to the heart from tissues and organs, operating under low pressure with thinner walls and a wider lumen compared to arteries.
  • Veins are equipped with one-way valves that prevent the backflow of blood, ensuring a unidirectional flow.
  • Capillaries are tiny blood vessels that facilitate the exchange of oxygen, carbon dioxide, and other nutrients between blood and cells.
  • Capillary walls are extremely thin, made of endothelial cells one cell thick, optimizing the diffusion process.
  • The structure of each type of blood vessel is closely related to its specific function in the circulatory system.

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