The outlines of anatomy, physiology, and hygiene Being an edition of The essentials of anatomy, physiology, and hygiene, rev to conform to the legislation making the effects of alcohol and other narcotics upon the human system a mandatory study in public schools . teless(specific gravity, ). It is used by physiciansto induce sleep. CHAPTER IL MINUTE STRUCTURE OF THE BODY. 2. Minute Structure of the Body.—The body,when its parts are examined with the microscope, isfound to be made up mainly of cells, fibers, Tind cell is considered to be the original elementout of which every ot
The outlines of anatomy, physiology, and hygiene Being an edition of The essentials of anatomy, physiology, and hygiene, rev to conform to the legislation making the effects of alcohol and other narcotics upon the human system a mandatory study in public schools . teless(specific gravity, ). It is used by physiciansto induce sleep. CHAPTER IL MINUTE STRUCTURE OF THE BODY. 2. Minute Structure of the Body.—The body,when its parts are examined with the microscope, isfound to be made up mainly of cells, fibers, Tind cell is considered to be the original elementout of which every other element in the body isformed ; fibers, fluids, etc., being derived from orgenerated by previously existing cells. The different consistency of different organs isdue to the varying proportions of these the fibers are in the largest proportion, the tissueor organ will be hard,tough, and elastic ; if thecells form the greatestpart, it will be soft, melas-tic, and vielding. 3. The Fiber. — Thefiber proper (Fig. i) is aslender thread, composedof a hard whitish or yel-lowish substance, some-times elastic and some-times not, but very tough and strong. Fibers are found in almost all parts of the body, binding the parts of organs together, and2. Fig. I.—Fibrous tissue. 6 INTRODUCTION. constituting almost the entire mass of some parts,as the tendons or sinews, for instance. The word fiber is also used of certain portions of muscularand nervous tissue, in a different sense from the onegiven above. These differences will be explainedhereafter. 4. The Cell.—The cell is the most importantstructure in the living body, whether animal orvegetable. Life resides in the cell; and everyplant or animal may really be looked upon as amass composed of billions of cells, each of whichis alive, and each of which has its own part to playin the nourishment of itself and the rest of thebody. A single cell * (Figs. 2 and 3) is a portion of al-
Size: 1572px × 1589px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., booksubjecthumananato, booksubjecthygiene, booksubjectphysiology
