Well, the blood has to be kept moving around all the time because it's the body's delivery system. Every possible part of the body has to be supplied with oxygen and food and water, and the veins and ...
PRESENTER:'Ella has P.E. today, and her circulatory system is going to have some exceptional challenges to overcome.' BOTH:Bye mum! PRESENTER:'We are going to follow the action in extreme detail.' ...
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