160 HOW FOOD IS PREPARED P^OR BODY USES 



consequent lack of proper chewing of food. The message of Mr. 

 Horace Fletcher in bringing before us the need of proper mastica- 

 tion of food and the attendant evils of overeating is one which we 

 cannot afford to ignore. It is a good rule to go away from the table 

 feeling a little hungry. Eating too much overtaxes the digestive 

 organs and prevents their working to the best advantage. Still 

 another cause of dyspepsia is eating when in a fatigued condition. 

 It is always a good plan to rest a short time before eating, especially 

 after any hard manual work. We have seen how great a part 

 unpleasant emotions play in preventing peristaltic movements of 

 the food tube. Conversely, pleasant conversation, laughter, and 

 fun will help you to digest your meal. Eating between meals is 

 condemned by physicians because it calls the blood to the digestive 

 organs at a time when it should be more active in other parts of 

 the body. The excessive use of ice cream sodas and other drinks 

 is bad for this reason and because it dulls appetite for regular 

 meals. Good habits of eating will go far in keeping one healthy. 



Place wheee 













Digestion is 



Secretion 



Enzyme 



Medium 



Substance 



End Product 



Brought 



Formed 



Contained 



Required 



Digested 



Formed 



About 













Mouth 



Saliva 



Ptyalin 



Alkaline 



Starch 



Grape 

 sugar 



Stomach 



Gastric 

 juice 



Pepsin 



Acid 



Protein 



Peptones 







Ren n in 



Acid 



Casein of 

 milk 



Coagulated 

 proteins 



Small 



Pancreatic 



Amylase 



Alkaline 



Starch 



Grape 



intestine 



juice 









sugar 



Small 



Pancreatic 



Trypsin 



Alkaline 



Proteins 



Amino- 



intestine 



juice 









acids 



Small 



Pancreatic 



Lipase 



Alkaline 



Fats 



Fatty acid 



intestine 



juice 









and 

 glycerine 



Small 



Succus 



Erepsin 



Alkaline 



Peptones 



Amino- 



intestine 



entericus 







and pro- 

 teoses 



acids 



Small 



Succus 



Maltase 



Alkaline 



Maltase 



Single 



intestine 



entericus 









sugars 



Small 



Succus 



Sucrase 



Alkaline 



Cane sugar 



Single 



intestine 



entericus 









sugars 



SmaU 



Succus 



Lactase 



Alkaline 



Milk sugar 



Single 



intestine 



entericus 









sugars 



