17 ANSWERS TO PRACTICAL QUESTIONS 



17. Why does the body of a drowned or strangled person 

 turn blue ? 



The blood is not purified in the lungs, and so blue or 

 venous blood fills the vessels. 



1 8. What are the little " kernels " in the arm-pits ? 



(See Physiology, page 123.) 



They are the lymphatic glands which sometimes become 

 swollen. 



19. When we are excessively warm, would the thermom- 

 eter show any rise of temperature in the body ? 



(See Physiology, page 119, note.) 



Probably not. In health, the average temperature of 

 the body does not vary more than 2. 



20. What forces besides that of the heart aid in propelling 

 the blood ? 



(See Flint's Physiology The Circulation ; Cutler's Analytic Anatomy^ etc.. 

 page 166, et seq.) 



The elasticity of the arteries and the veins, the force 

 of capillary attraction in the capillaries, etc- 



2 1. Why can the pulse be felt best in the wrist ? 



It is, in general, a mere matter of convenience. We 

 can feel it not only in the radial artery at the wrist, but 

 in the carotid of the neck, the temporal of the forehead, 

 the popliteal * in the inner side of the knee, etc. 



* If the hollow of the knee of one leg be allowed to rust upon the knee ol 

 the other one, it may be remarked that the point of the suscended foot moves 

 visibly up and down at each beat of the pulse. 



