Anatomy, physiology and hygiene for high schools . body, the micleus, inits center. A fully formed cell con-sists of three parts: 1. The cell The dense nucleus (Latin,a kernel)? imbedded in thecell body. 3. A very dense body looking like a dot in thenucleus, the nucleolus (Latin, a little kernel). Seen underthe microscope, alive and floating singly in the blood, ablood cell looks something like a jellyfish. The cells of dif-ferent tissues vary in shape and size and in the plan oftheir arrangement. Some are spherical, some flat and rec-tangular ; some are spindle-shaped and have process
Anatomy, physiology and hygiene for high schools . body, the micleus, inits center. A fully formed cell con-sists of three parts: 1. The cell The dense nucleus (Latin,a kernel)? imbedded in thecell body. 3. A very dense body looking like a dot in thenucleus, the nucleolus (Latin, a little kernel). Seen underthe microscope, alive and floating singly in the blood, ablood cell looks something like a jellyfish. The cells of dif-ferent tissues vary in shape and size and in the plan oftheir arrangement. Some are spherical, some flat and rec-tangular ; some are spindle-shaped and have processes manytimes longer than themselves, which help to make up the tis-sue of which they arethe cells. Properties of cells. Thecell as it exists in thebody is alive. It takes upnourishment, builds upsubstances within itself,reproduces its kind. Some cells have the power of motion,known as amoeboid motion (Greek ameiho, I change) (seeGlossary). By this motion, which enables the cell to changeits shape and to throw out processes, it can become long and. Amoeboid cell, showing changes inshape due to its motion. 18 PHYSIOLOGY AND HYGIENE thin, so as to slip through fine openings, or can surround aparticle of substance with which it comes in contact. In the cells all the vital processes of the body occur. Theyare the furnaces in which the (Combustion which producesthe body energy takes place. In them the growth of thetissues goes on. Growth. Growtli of the body parts and tissues takes placeprimarily through the cells. At the start, as described, the cells divide, form-s, ^ iui)- more cells;^___^ ^in %^* §^^^. they develop pro-^W^^ ^^-^^ ~^- r4^^4- cesses and fibers,fe-^rl/ -^-^y and form in-^^ tercellular sub-Division of cells. ^^^^^^^^ i^ t^« way building up tissues, which, forming together, make the parts and theorgans. Throughout childhood and youth this formation ofnew cells and new tissue is ver}^ active. Tissue is formedmuch more rapidly than it is used up, and tlnis the body an
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