B7 circulation

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  • B7- circulation
    • Moving molecules
      • Active muscles need a good supply of glucose and oxygen
      • Arteries carry blood to your organs
      • In fine capillaries, useful molecules are passed from the blood to the cells
      • Double circulatory system gets blood to both the lungs and the body
        • This requires a double pump
        • High pressure needed for the whole body
        • Lower pressure needed for the lungs
    • Blood
      • Plasma
        • The pale yellow fluid the cells float in
        • Transports materials such as : glucose, antibodies, hormones and waste (urea and CO2)
        • Helps to distribute heat
      • Red blood cells
        • Packed with the protein haemoglobin
          • binds oxygen as it passes through the blood
        • Biconcave shape allows more surface area making diffusion of gases more efficient
        • Flexible to fit through capillaries
      • White blood cells
        • Protect the body from infection
        • Phagocytosis (engulf and digest/ produce antibodies)
      • Platelets
        • Fragments of the cell from the cytoplasm
        • Cause clotting (when cut)- stop toomuch blood loss
    • Double circulation
      • Each side has 2 chambers, atrium and ventricles
      • Blood from the body enters the right atrium of the heart
        • Pumped thought the right ventricle to the lungs to become oxygenated
          • Returns to the left atrium and passes to the left ventricle
            • Gets a harder pump to push it around the body ( thicker ventricle muscle)
              • Blood becomes deoxygenated then returns to the right atrium
                • Blood from the body enters the right atrium of the heart
                  • Pumped thought the right ventricle to the lungs to become oxygenated
                    • Returns to the left atrium and passes to the left ventricle
                      • Gets a harder pump to push it around the body ( thicker ventricle muscle)
                        • Blood becomes deoxygenated then returns to the right atrium
      • Valves
        • Heart valves
          • Between each atrium and ventricle
          • Between the ventricles and the arteries
        • Veins
          • Lower blood pressure than arteries
          • Stop it flowing backwards
      • capillary bed/ network
        • The double pump gives the blood enough energy to reach the capillaries
        • One cell thick so exchange is easier
        • Tissue fluid
          • When blood plasma is squeezed out of a capillary
          • Bathes all our cells
          • Oxygen and glucose diffuse from it to the cells
          • Waste products like CO2 and urea diffuse into the fluid

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