• Blood is a fluid connective tissue.
  • It circulates throughout the body through blood vessels by the pumping action of the heart.
  • Blood contains many dissolved substances and blood cells.
  • Types of blood cells in plasma include red blood cells, white blood cells, and platelets.
  • Blood type is a genetic characteristic associated with the presence or absence of certain molecules, called antigens, on the surface of red blood cells.
  • The most commonly known blood types are the ABO and Rhesus blood types.
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