Disease and Its Causes

Disease and Its Causes

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4.5
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Disease and Its Causes by William Thomas Councilman

Published:

1913

Pages:

154

Downloads:

8,355

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Disease and Its Causes

By

4.5
(2 Reviews)

Book Excerpt

ase of many animals it seems as though the necessity of a fluid environment for living matter did not apply, for the superficial cells of the skin have no fluid around them; these cells, however, are dead, and serve merely a mechanical or protective purpose. All the living cells of the skin and all the cells beneath this have fluid around them.

Living matter occurs always in the form of small masses called "cells," which are the living units. The cells vary in form, structure and size, some being so large that they can be seen with the naked eye, while others are so small that they cannot be distinctly seen with the highest power of the microscope. The living thing or organism may be composed of a single cell or, in the case of the higher animals and plants, may be formed of great numbers of cells, those of a similar character being combined in masses to form organs such as the liver and brain.

In each cell there is a differentiated area constituting a special structure, the nucleus, which contains a pe

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