We have learned about the 'double circulation' system within our bodies, and also that it was British scientist William Harvey who made the discovery that the heart pumps blood around the blood vessels, including arteries, veins and capillaries. Previously, people had thought that blood was continuously produced by the liver, but through his experiments Harvey was about to ascertain that the same blood goes round our bodies repeatedly...
We simulated the circulatory system in one lesson, showing how blood takes oxygen from the lungs around the body, and in return brings carbon dioxide (which is a waste product of the body) back to the lungs to be expelled as we breathe out.
