RESPIRATION AND EXCRETION 



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muscle fibers in the walls of the capillaries are either relaxed 

 or injured, thus permitting more blood to pass through them. 



2. Try naming some of the common characteristics of con- 

 gestion or inflammation, color, appearance, feeling, etc. 



Conclusions. 1. Just what do you understand is meant by 

 the term ' congestion ' ? 



2. What condition of the capillaries must be brought about 

 in order to reduce congestions or inflammations ? 



b. Some Common Inflammations 



Observations. 1. What name is given to congestions in the 

 nasal cavity? In the pharynx? In the larynx? In the 

 chest ? In the stomach ? In the intestine ? 



Ill 



FIG. 77. A, diagram of circulation from artery through capillaries to vein of 

 frog. B, diagram of circulation in congestion, showing dilatation of blood 

 vessels and crowding of corpuscles. (After Warren.) 



2. What are some of the symptoms showing congestions in 

 these organs ? 



Conclusions. 1. What must be the general appearance and 

 condition of these parts of the respiratory and alimentary 

 tracts when so influenced ? 



