QUESTIONS 27 



gastric juice, pigment of the eyes, hair, and skin. It 

 is found in chemic combination only, as ferric acid 

 and in organic compounds. 



There are constituents of the body, aside from 

 proteins, fats, carbohydrates, and inorganic salts, 

 which can only be located by the various chemic 

 analyses and tests. They are the substances resulting 

 from the numerous and complicated changes con- 

 tinually taking place in the food we eat and water we 

 drink, as a result of digestion, absorption, etc. They 

 are carried to the tissues, where they perform their 

 functions, and then are taken up from the tissues by 

 the blood and carried to the skin (as perspiration), 

 kidneys (as urine), lungs (as carbon dioxid), and intes- 

 tines (as feces), to be eliminated as waste materials. 

 These substances are: (1) Organic acids, e. g., acetic, 

 lactic, oxalic, butyric, in combination with alkalin 

 and earthy bases. (2) Organic substances, e. g., alco- 

 hol, glycerin, cholesterin. (3) Pigments found in the 

 bile, urine. (4) Nitrogenized (crystalline), as urea, 

 uric acid, xanthin, creatin, creatinin, and hippuric 

 acid. (Brubaker.) 



QUESTIONS 



1. What does an analysis of the human body show it to consist 

 of? To what groups of chemic and plant world do these compounds 

 belong? 



2. What do you understand by the term proximate principles? 



3. What do the organic compounds consist of? The inorganic? 



4. Name the chemical elements found in the human body. 



5. What chemic compounds found in the human body represent 

 the carbohydrates? 



6. What do the carbohydrates contain and in what proportion? 



7. What is the essential benefit derived from a nourishment rich 

 in carbohydrates? 



8. Name the three groups of carbohydrates? 



9. Where is starch found in the vegetable and plant world? 



10. Where is dextrose or grape-sugar found? Levulose or fruit- 

 sugar? Saccharose or cane-sugar? Lactose or milk-sugar? 



11. Do fats belong to the organic or inorganic group of compounds? 



12. Are they as valuable as carbohydrates as a source of heat 

 and energy? 



