Читать книгу The House We Live In; or, The Making of the Body онлайн

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Helen: If moving about kills the cells, will they live longer if we keep still?

Mother: No, they are made to live just so long, and will die anyway. If we should not work or play, the dead cells would stay in the body, and make no end of mischief; but when we move about, it helps to carry them away, and new ones take their places. So you need not be afraid to run and jump, play and work; for the cells will take care to keep the house you live in all right, if you only give them the right kind of food, and not too much of it.

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OUR FRAME

OTHER: Every building must have a foundation and a frame of some kind to make it strong and give it shape. It is the same with the house we call our body. The frames of houses which men build are made of wood or iron; but the framework of the body is built of bones. Perhaps you have noticed that in the frames of buildings some pieces of timber are short, and some are long, and they are cut into many different shapes and sizes. So it is with the bones of the body. How many do you think it takes to make our frame?