EXERCISE 83 



> Problem. What is the structure of the skin ? 

 What to use. A good microscopic section or a chart or a model. 



What to do. Study the section of the skin and note a hair follicle, oil glands, a sweat gland, nerves 

 nd nerve endings, and the different layers of skin. 



Record. Make a carefully labeled drawing showing all the structures mentioned. 



Questions. 1. Is the excretion of the skin acid or alkaline ? How do you know ? 



2. What is the effect of too frequent washings with soap ? Why not use laundry soap on the skin ? 



3. What is the effect of too infrequent washings ? 



4. What is a corn ? Why does it hurt ? Why can we cut the surface without causing pain ? 



5. What animal coverings correspond in type to our skin ? What animal coverings are of a 

 different type ? 



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