Class 11 Biology Body Fluids Circulation Introduction


  • The waste or harmful substances produced, have to be removed continuously for healthy functioning of tissues.
  • Sponges and coelenterates circulate water from their surroundings through their body cavities to facilitate the cells to exchange these substances
  • Blood is the fluid connective tissue in most of the higher organisms including humans.
  • Lymph is the fluid which circulates through the lymphatic system and helps in the transport of certain substances.


Fig. Blood

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