. Applied physiology : including the effects of alcohol and narcotics . work it does, but all are ex-ceedingly small. They are held in place by fine stringscalled connective tissue. By scraping the skin, cells canbe removed from its surface. They look like flour. 3. Mind rules the cells. — The mind takes good careof these cells. When we eat we feed the cells, and webreathe so that each cell can get a little air. To repay themind for its care the cells all work together like good ser- CELLS 9 vants to do just as the mind tells them. Thus, when themind wants to walk, all the cells of the legs ge
. Applied physiology : including the effects of alcohol and narcotics . work it does, but all are ex-ceedingly small. They are held in place by fine stringscalled connective tissue. By scraping the skin, cells canbe removed from its surface. They look like flour. 3. Mind rules the cells. — The mind takes good careof these cells. When we eat we feed the cells, and webreathe so that each cell can get a little air. To repay themind for its care the cells all work together like good ser- CELLS 9 vants to do just as the mind tells them. Thus, when themind wants to walk, all the cells of the legs get themselvesunder the body and push the body ahead. They do it sowillingly that we do not think how hard they have towork. When the mind wishes to stop, it tells the cells ofthe legs that they need not work any more until it wishesto move again. Sometimes it is very hard for the mind to teach the cellsto work just as they should and to keep still when theyought. Boys and girls go to school so that they may learnhow to make the cells obey the mind. We ought to take. Water, 12 gallons Albumin or gelatine, 20 lb. Fat, 10 lb. Substances of which the body is composed. good care of our bodies because the living cells of whichthey are composed make such good servants for the mind. 4. Of what the cells are made: water. — About threefourths of each cell of the body is water. Water is foundeven in teeth and in bone. All animals must have waterto drink. Even the driest food, like crackers, has a greatdeal of water, while other kinds, like meat and potatoes,are nearly three fourths water. In all, a man swallowstwo or three quarts of water each day. 5. Albumin. — Next to water something which is like 10 APPLIED PHYSIOLOGY the white of an egg forms the most of the body. Thissubstance is called albumin, because when boiled it be-comes white and hard. It is the living part of cells andmust be eaten to sustain their life. It is found in all food,both animal and vegetable. We eat about fou
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