The human body, on average, is made up of between seventy trillions to one hundred trillions (70,000,000,000,000+) of cells. They belong to something over 200 different cell types, each performing quite different tasks inside our body. In terms of size, each one of these cells is no bigger than the dot following this sentence. Do these facts amaze you? They did to me. The picture shown here is a cross-sectional view of a human cell. As we can see, there are so many different component parts...
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