Biology B3 - The circulatory system

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Blood is used to transport materials around the body, and to protect against disease. Blood contains plasma, a liquid that contains dissolved substances, cells and cell fragments. These include:

  • Red blood cells, which transport oxygen
  • White blood cells, which protect against disease
  • Platelets, which help the blood to clot

FeatureReason Small size Lets red blood cells pass through narrow capillaries Flattened disc shape Provides a large surface area, allowing rapid diffusion of oxygen Contains haemoglobin Haemoglobin absorbs oxygen in the lungs…


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