B3 - The heart

Descripción

GCSE (B3) Biology Mapa Mental sobre B3 - The heart, creado por Lily O'Brien el 29/03/2017.
Lily O'Brien
Mapa Mental por Lily O'Brien, actualizado hace más de 1 año
Lily O'Brien
Creado por Lily O'Brien hace más de 7 años
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Resumen del Recurso

B3 - The heart
  1. A double circulatory system - 2 circuits joined together
    1. First one pumps deoxygenated blood to the lungs to take in oxygen. The blood then returns to the heart.
      1. The second pumps oxygenated blood around all the other organs of the body. The blood gives up its oxygen at the body cells and the deoxygenated blood returns to the heart to be pumped out to the lungs again.
      2. The heart contracts to pump blood around the body
        1. The heart is a pumping organ that keeps the blood flowing around the body. The walls are mostly made of muscle tissue.
          1. This is how the heart uses its 4 chambers (right, left atrium , right,left ventricle to pump blood around
            1. 1 - blood flows into the 2 atria from the vena cava and the pulmonary vein. 2 -The atria contract, pushing the blood into the ventricles. 3- The ventricles contract, forcing the blood into pulmonary artery and the aorta, and out of the heart. 4- blood then flows to the organs through arteries and returns through veins. 5- The atria fill again and the whole cycle starts over
          2. The heart has valves to make sure that blood goes in the right direction - to prevent it flowing backwards.
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