1_Blood & Circulation

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GCSE Biology Mind Map on 1_Blood & Circulation, created by jaeg lawson on 05/01/2016.
jaeg lawson
Mind Map by jaeg lawson, updated more than 1 year ago More Less
Scott Church
Created by Scott Church almost 9 years ago
jaeg lawson
Copied by jaeg lawson almost 9 years ago
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1_Blood & Circulation
  1. Red Blood Cells
    1. Contain no nucleus ( have a dip in the centre)>more oxygen carried
      1. Large surface area compared to volume > oxygen close to surface
      2. Platelets
        1. Platelets clot the blood after a wound > prevents infection and blood loss
          1. People with haemophilia have a faulty gene for the clotting process
          2. White Blood Cells
            1. Larger than red blood cells, flexible shape to help engulf disease organism
              1. Protects against infection by digesting harmful microbes, bacteria digested inside WBC
                1. Able to squeeze out of capillaries to defend different tissues
                2. Plasma
                  1. Contains mostly water, dissolved food, urea, hormones and carbon dioxide
                    1. Pale yellow fluid carries blood cells, useful substances and waste around the body through blood vessels
                    2. Pulmonary Artery > Carries blood from the heart to the lungs
                      1. Aorta (Artery) > Carries blood from heart to body
                        1. Pulmonary Vein > Carries blood from lung to heart
                          1. Vena Cava (Vein) > Carries blood from body to heart
                            1. heart
                              1. how is works
                                1. blood flows into the atrias from the vena cava and pulmonary vein
                                  1. atria contracts pushing blood into the ventricles
                                    1. ventricles contract forcing blood to the lungs through the pulmonary artery and to the body through the aorta
                                      1. blood flows to the heart from the bady through the vena cava and from the lungs through the pulmonary vein
                                        1. this refills the atrias and restarts the process
                              2. blood vessels
                                1. Arteries = Away
                                  1. Arteries have thick walls because the blood pressure is very high. They also have thick elastic walls
                                  2. Capillaries = Small cells
                                    1. walls are one cell thick to allow substances to be transferred
                                    2. veins=away
                                      1. veins have valves to prevent backflow
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