. A civic biology : presented in problems. Biology; Sanitation. THE HUMAN MACHINE 207 in groups as tissues and organs that make the complicated actions of man possible. Division of labor has arisen because of the complex needs and work of the organism. The Human Body a Machine. - - In all animals, and the human animal is no exception, the body has been likened to a machine in that it turns over the latent or potential energy stored up in food into kinetic energy (mechanical work and heat), which is manifested when we perform work. One great difference exists be- tween an engine and the human b
. A civic biology : presented in problems. Biology; Sanitation. THE HUMAN MACHINE 207 in groups as tissues and organs that make the complicated actions of man possible. Division of labor has arisen because of the complex needs and work of the organism. The Human Body a Machine. - - In all animals, and the human animal is no exception, the body has been likened to a machine in that it turns over the latent or potential energy stored up in food into kinetic energy (mechanical work and heat), which is manifested when we perform work. One great difference exists be- tween an engine and the human body. The engine uses fuel unlike the substance out of which it is made. The human body, on the other hand, uses for fuel the same substances out of which it is formed ; it may, indeed, use part of its own substance for food. It must as well do more than purely mechanical work. The human organism must be so deli- cately adjusted to its surroundings that it will react in a ready manner to stimuli from without; it must be able to utilize its fuel (food) in the most economical manner; it must be fitted with machinery for transforming the energy received from food into various kinds of work; it must properly provide the machine with oxygen SO that the fuel will be Oxidized, and the The human body seen from products of oxidation must be carried the side in longitudinal SGC LI Oil* away, as well as other waste materials which might harm the effectiveness of the machine. Most important of all, the human machine must be able to repair itself. In order to understand better this complicated machine, the human body, let us briefly examine the structure of its parts and thus get a better idea of the interrelation of these parts and of their Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Hunter, George W. (Ge
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