PROBLEM 186 223 



Examine carefully in a strong light each of your teeth and 

 answer the following questions, marking the points asked for 

 on a chart of your teeth copied from the preceding diagram. 

 1. With a bracket, label each group of teeth. 2. With a cross, 

 mark all the teeth you have lost or that have not grown. 3. Mark 

 all cavities not filled in your teeth by a spot where the cavity 

 exists. 4. If teeth have been filled, crowned, etc., mark with 

 appropriate title. 



Conclusion. — What is the condition of my teeth? Should I 

 co to a dentist? 



Problem 186: To demonstrate the function and structure of 

 simple gland. 



Materials. — Fehling's solution, test tube, cracker, stained 

 lide showing longitudinal and cross sections of a gland. 



a. Function 



Method and Observations. — Think of a lemon or a pickle. 



r hat happens in your mouth? Collect some of the saliva. 



r hat is its appearance? 



Chew up a cracker having no sugar in it. After the mass is 

 r ell mixed with saliva put in the test tube and place the tube in 

 warm water for an hour. Then test with Fehling's solution. 

 What is the result ? 



Conclusion. — 1. With what structures in the human body is a 

 gland connected? 



2. What is one function of the juice poured out by the salivary 

 glands of the mouth? 



b. Structure 



Observations. — Under the microscope, notice the structure of 

 a gland in both cross and longitudinal sections. With what is the 

 wall lined ? What is the shape of the gland ? (See textbook.) 

 If work is done by a gland, then it must have food to do this work. 

 Might the material poured out of a gland be manufactured from 

 the food it gets? 



What structures would of necessity go to a gland to take food 

 there? Look at the diagram in your textbook. 



