Some cells do repairs if you get a cut. Red blood cells deliver oxygen and take away rubbish. And your white blood cells are like police looking for germs. There's a lot going on inside you!

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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 ...

Acute respiratory failure occurs when your lungs cannot release enough oxygen into your blood, which prevents your organs from properly functioning. It also occurs if your lungs cannot remove ...