. The human body and health : an elementary text-book of essential anatomy, applied physiology and practical hygiene for schools . Fig. 4. â Drawings of sections of cells. Magnified. &, bone cell; c,epithelium cell from the intestine; e, flat epithelium cell from themouth ; /, fat cell; n, nerve cell from the brain ; rn, muscle cell. of a slipper, though its outline changes much when itrubs against an object. The delicate cell wall is elastic and transparent, and iscovered with fine hair-like processes calledcilia^ by moving whichit swims rapidly. Afaintly darker oval spotnear the center is th
. The human body and health : an elementary text-book of essential anatomy, applied physiology and practical hygiene for schools . Fig. 4. â Drawings of sections of cells. Magnified. &, bone cell; c,epithelium cell from the intestine; e, flat epithelium cell from themouth ; /, fat cell; n, nerve cell from the brain ; rn, muscle cell. of a slipper, though its outline changes much when itrubs against an object. The delicate cell wall is elastic and transparent, and iscovered with fine hair-like processes calledcilia^ by moving whichit swims rapidly. Afaintly darker oval spotnear the center is thenucleus. It takes infood consisting chieflyof tiny plants calledbacteria^ through a. groove on one side. The Fig. 5. âSlipper animalcule begmmng to ^ divide and thus to form two cells, each of food, when within the which will swim away as a distinct animal, protoplasm, is dissolved, The nucleus has already divided. Photo- ^ ^ graphed through the microscope. and SOme of it beCOmeS. KINDS OF CELLS IT a part of the animal itself, while the rest is pushed outthrough the cell wall. This tiny living thing has nobones, muscles, liver, stomach, blood vessels, lungs, ornerves, yet it moves, eats, and gives off the same kind ofsubstances as those cast out by the lungs and kidneysof man. It isaffected by heat,cold, light, andtouch. This sin-gle cell performs adozen duties, foreach of which inthe human bodythere is a separategroup of cells. Kinds of Cells. âIn the h u m a nbody there aremore than a scoreof different kindsof cells. Eachkind has a specialduty to performand is worthlessfor any other serv-ice. The muscle cells are threadlike and can becomeshorter or longer to move the bones. The fat cells arenearly spherical, while the cells lining the stomach and in-testines are columnar and take from the blood somethingwhich they change into a juice to dissolve the food. Thenerve cells are of various shapes, but most of them have DAV. PHYS. 2 ⢠* â¢< ft ⢠â¢â¢ â
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