Primary Lessons in Human Physiology And Health

Cover Primary Lessons in Human Physiology And Health
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This heats the water until it turns to steam; the steam pushes on the piston and moves it. The piston is connected with the rest of the machinery and thus the work is done. In this we get both heat and motion by burning coal. In burning the coal we must have plenty of air. The air is a mixture of sev- eral things. One of them is the gas oxygen. It is the oxygen of the air that is used in burning the coal. Both the coal and the oxygen are necessary to produce the heat and motion. If either is la...cking, the fire goes out and the engine stops.
How the Body is like an Engine. To keep itself warm and to perform its varied motions, the human body, like the steam engine, requires oxygen, while WHAT HEAT DOES 6?
food takes the place of coal. Indeed, the food we eat contains some of the same substances that are in coal, and if we dry it, we can burn it in the furnace of an engine and cause heat and motion. Now some other things show the body to be acting like a steam engine* If you catch all the substances which come out of the chimney and examine them carefully, they are found to be mainly carbonic dioxide and vapor of water, and then if you examine the substances which the body throws off at the lungs, skin, and kidneys, they also are found to consist mainly of carbonic dioxide and water.


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