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BIOLOGY FOR BEGINNERS 



Functions, waste. 



Aids digestion and absorption of fats. 



Stimulates intestinal action. 



Antiseptic action. 

 General functions. 

 Excretion of waste. 

 Secretion of a digestive fluid. 

 Storage of sugar excess as glycogen (why?). 

 Pancreas, location. 



Fluid, abundant, alkaline. 

 Composition. 



Ferment changes [to] 



Amylopsin starch 



Trypsin proteid 



Steapsin fats 



soluble 

 sugar 

 peptone. 



fat acids, soaps, glyc- 

 erin. 



Preparatory steps in nutrition. 



Food-getting, cooking, chewing. 



Salivary digestion, gastric digestion (further breaking up). 

 Intestinal digestion (most important). 

 What processes are these steps a preparation for? 

 Absorption. 



What is the general purpose of digestion? 



What is the process on which absorption is based? 



Absorption is the passage of food from digestive tract to blood. 



May take place, 



1. Directly into capillaries in stomach and intestine walls. 



2. Via lymph capillaries (lacteals) in villi. 



Assimilation. 



Meaning of word. 

 Definition. 



