The cardiovascular system

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  • The cardiovascular system
    • Allows blood to circulate around the body to transport & supply essential nutrients multi-cellular organisms need to survive & maintain homeostasis
    • AKA the circulatory system
    • Cardiac cycle - a complete heart beat from the generation of the beat to the beginning of the next beat
    • The cardiovascular system contains...
      • Heart
      • Blood vessels
      • Blood
        • A tissue that always flows through blood vessels
        • Responsible for regulating...
          • Volume of fluid in circulation
          • Body temperature
          • pH of body tissues
        • Protects us because it has...
          • Platelets - cause clotting to prevent bleeding & the entry of pathogens
          • leukocytes - defend us against infection
        • Made up of erythrocytes, leukocytes, thrombocytes & plasma
          • Erythrocytes - red blood cells, contain haemoglobin that transports oxygen around the body
          • Leukocytes - white blood cells, there are many different kinds
          • Thrombocytes (platelets) - component of blood involved in blood clotting
        • Responsible for transporting...
          • Oxygen - lungs to body cells (aerobic respiration)
          • Carbon dioxide - respiring cells back to lungs (exhalation)
          • Urea (waste product) - liver to kidney (urination)
          • Nutrients - intestines to body cells
          • Heat - respiring tissue to - organs to maintain body temperature/ skin to be lost
          • Hormones - endocrine glands to target organs


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