Circulatory System

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  • Created by: Lucy
  • Created on: 02-10-13 17:34
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  • Veins
    • Circulatory System
      • Open Circulation
        • Blood is not enclosed in vessles
        • Ostia- Small pores where gas exchange occurs and where blood re-enters the pump
  • Tubular Heart is the 'pump' that pumps the blood into the empty space
    • Open Circulation
      • Blood is not enclosed in vessles
      • Ostia- Small pores where gas exchange occurs and where blood re-enters the pump
  • Has valves to prevent backflow
    • Closed Circulation
      • Circulatory System
      • Blood always flows in vessels
        • Closed Circulation
        • Single Circulatory System
          • Eg. Fish
            • Single Circulatory System
            • Blood flows through the heart once per circulation
              • Heart --> Gills --> Body --> Heart
                • Double Circulatory System
                  • Eg. Mammals
                  • Pulmonary Circuit carries de oxygenated blood to the lungs
                  • Systemic Circuit carries oxygenated blood to body tissue
                • Systemic Circuit carries oxygenated blood to body tissue
                • Its easier to maintain a set temperature and control it
                  • Advantages
                    • Double Circulatory System
                      • Eg. Mammals
                      • Pulmonary Circuit carries de oxygenated blood to the lungs
                    • Takes oxygenated blood simultaneously at high pressure to all regions of the body
                    • The oxygenated blood reaches respiring cells quickly
                • Arteries
                  • Carry oxygenated blood away from the heart
                  • Small Lumen
                  • The Elastic tissue wall can contract and constrict the Artery
                • Capillaries
                  • Very thin Tunica Externa
                  • Takes blood very close to cells
                  • Goes from High pressure to low pressure
                • Small Lumen
                • A thick Tunica Externa to give it strength
                  • Arteries
                    • Carry oxygenated blood away from the heart
                    • The Elastic tissue wall can contract and constrict the Artery
                • Carries blood under high pressure
                  • Endothelium cells can unfold when the artery streches
                    • Carry de oxygenated blood towards the heart
                      • Veins
                      • Large Lumen
                        • Thin tunica externa
                          • Contains valves to prevent backflow
                            • No constriction of blood flow
                              • Carries blood at a low pressure
                                • Very thin Tunica Externa
                                • Walls are a single layer of cells making gas exchange very efficient
                                  • Capillaries
                                    • Takes blood very close to cells
                                    • Goes from High pressure to low pressure
                                • Small lumen
                                  • Network of thing tubes which link Arteries to Veins and take blood close to cells for gas excahnge

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