SYSTEMS AND ORGANS OF THE BODY
How the Body is Built.—In a building such as the body it is well to begin with the unit—the building unit. In a house this is a brick or a stone; in all living structures, animal and vegetable, it is a cell.
All living structures, whether animal or vegetable, are built up of cells (which we shall consider in due course), and these cells are grouped together for different purposes to form different tissues. The tissues are the different materials of which the body is made. There are eight principal tissues in the body: bone, gristle, muscle, nerve, skin, fat, fiber, and connecting tissue.
ORGANS OF CHEST CAVITY IN RELATION TO STOMACH
THE BRONCHIAL TUBES
ORGANS INVOLVED IN FIRST STAGES OF DIGESTION
