APPLIED PHYSIOLOGY 



If he heeds these signs his mind and body will work 

 together as one for seventy years and more. He will be 

 able to resist germs of disease, while no cause of sickness 

 will arise within the body itself. He will go through life 

 with a buoyant sense of strength, eager to do the work 

 which his thoughts are ever planning. 



SUMMARY 



1. Muscles cover the bones and move the joints. 



2. A muscle is a bundle of stringlike cells. When nerves 



bring it orders to act, it makes itself shorter and 

 pulls its ends together. 



3. A muscle usually ends in a long tendon which crosses 



a joint and is fastened to another bone. ' 



4. Muscles are lean meat. They can be felt in the arms 



and legs. 



5. By use, a muscle grows larger and stronger. 



6. By too great use, a muscle is used up faster than the 



blood builds it again. 



7. The power of a muscle comes from the heat of oxi- 



dized food. 



8. In exercise a muscle needs more food and air, which 



the stomach, heart, and lungs supply by working 

 harder. 



9. Useful and interesting work is the best exercise. 



10. Alcohol keeps the stomach from preparing food for 

 - the muscles, and takes away their oxygen. Thus it 



diminishes their strength. 



11. Tobacco poisons the muscles. 



12. By living as well as we know how, we shall keep the 



body strong and healthy until old age. 



