. The human body and health : an elementary text-book of essential anatomy, applied physiology and practical hygiene for schools . nking in a liquid incontact with it, somewhat as a sponge absorbs water. Osmosis may be shown with the egg experiment (). By cracking the shell on the large end of an eggit may be removed Avith-out breaking the thinskin beneath. Througha hole made in the smallend of the eo-o- a knifeblade may be thrustdown to pierce the mem-brane around the oiass tube is then tobe pushed through thesmall end into the yolk,and the tube firmlycemented to the shellwdth pa
. The human body and health : an elementary text-book of essential anatomy, applied physiology and practical hygiene for schools . nking in a liquid incontact with it, somewhat as a sponge absorbs water. Osmosis may be shown with the egg experiment (). By cracking the shell on the large end of an eggit may be removed Avith-out breaking the thinskin beneath. Througha hole made in the smallend of the eo-o- a knifeblade may be thrustdown to pierce the mem-brane around the oiass tube is then tobe pushed through thesmall end into the yolk,and the tube firmlycemented to the shellwdth paraffin or sealingwax melted in place with a hot nail. The egg is thenplaced tube up ia a glass of water, and propped upwith a stick so as to be only half immersed. In lessthan an hour enough water will have passed throughinto the egg to force the yolk far up in the glasstube, but none of the proteid of the egg will havebeen pushed through the membrane into the water,because proteids must be acted on by the digestive juicesbefore they can pass through a membrane. Some of thesalt in the egg will have passed out into the Fig. 65. —Part of the iutestine, showing theveins taking the food from the villi tothe liver. 102 HOW FOOD IS DIGESTED How the Body uses Proteids and Carbohydrates. — Most of the proteids are used in rebuilding the worn-out tissuesof the body, but some may be oxidized to produce is possible for a proteid to be changed into fat. The carbohydrates, before entering theblood, are all changed into sugar,which passes through the villi andveins to the liver. Here one part ofit is changed into animal starchy calledglycogen^ and is retained until thecells of the body call for it. Asecond part of the sugar is carriedto the muscles, and stored, while athird part circulates in the blobd, andcombines with oxygen to make oxygen combines with sugar morereadily than with proteids, the sugaris used for heat and energy first, thusleaving the proteids fo
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