1 68 ANSWERS TO PRACTICAL QUESTIONS 



7. Why does not the arm die when the surgeon ties the 

 principal artery leading to it ? 



The anastomoses of the arteries enable a collateral 

 circulation to be established, whereby blood is supplied 

 to the arm. 



8. When a fowl is angry, why does its comb redden ? 



Because an extra quantity of blood is thrown into that 

 part of the body. 



9. Why does a fat man endure cold better than a lean 

 one? 



Fat is a good non-conductor of heat, and helps to pre- 

 serve the uniform temperature of the body. 



10. Why does one become thin during a long sickness ? 



By absorption, the fat of the body is taken up and 

 used to supply the wants of the system. The old flesh 

 being renewed with new, vigorous material, after such a 

 wasting sickness, a person often has better health than 

 previous to it. 



11. What would you do if you should come home "wet 

 to the skin ?" 



One should (i) go into a warm room; (2) remove all 

 wet garments ; (3) if chilled, take a hot, full- or foot-bath, 

 and by gentle friction restore the circulation ; (4) put on 

 dry clothing. 



12. When the cold air strikes the face, why does it first 

 blanch and then flush ? 



