Hygienic Physiology |
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action adapted allow animals appear arteries become blood blood-vessels body bones brain branches called capillaries cartilages cause centre CHAPTER chest closed cold color commence composed connected considered contain contract course depend Describe direction disease duties effect excretion exercise exist external feel flow fluid front hand head heart heat Illus important increase influence injured internal kinds lead less light lining liver lower lungs means mind motion mouth muscles muscular natural necessary nerves nervous noticed nourishment object opening organs passes person Physiology plate portion pressure prevent produced proper quantity receive removed represents respect ribs second stomach seen sensations sense sides skin sometimes stomach substance supposed surface take place taken thing tube upper usually various veins vessels warm windpipe