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But the very first man that ever laid a pipe to carry water was simply imitating nature only about ten or fifteen million years behind her. No sooner has our food passed through the cells in the wall of the food-tube, than it goes straight into a set of tiny tubes the blood-pipes, or blood vessels which carry it to the heart; and the heart pumps it all over the body. Veins and Arteries.
Why the Blood is Red. The first and main purpose of the blood-pipes and the heart is to carry the dissolved food from the stomach and intestines to the cells all over the body. But the cells need air as well as food; and, to carry this, there are little basket-cells the red corpuscles. Take a drop of blood and put it under a microscope, and you will see what they look like.
The food, of course, is put into the mouth, chewed by the teeth, and softened and digested in the stomach and intestines. It is then taken up by the cells of the mucous coat of the intestines and passed into the network of tiny blood-pipes surrounding them, between the lining of the bowels and their muscular coat. All details are omitted.
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