Chap. XVIII] 



SUMMARY 



361 



Sweat 



Activity of 

 Sweat- 

 glands 



Body Heat 



Amount increased 

 by 



8. Csrtain diseases • 



Amount decreased 

 by 



Animals divided 

 into 2 classes 



Tuberculosis. 

 Acute rheuma- 

 tism. 

 Malaria. 

 9. Use of electricity to stimulate 

 secretory nerves. 

 Voiding a large quantity of urine. 

 Cold. 

 Diarrhoea. 

 Certain drugs. 



r Fevers. 

 Certain diseases < Diabetes. 



I Some paralyses. 



1. Direct stimulation of nerve-ending in sweat-glands. 



2. Indirect stimulation of nerve centres controlhng per- 



spiration. 

 [ 3. Action of vasomotor nerves on calibre of blood-vessels. 



1. Warm-blooded or those which have 

 an almost constant temperature. 



Human beings are in this class. 



2. Cold-blooded or those whose tem- 

 perature varies with that of 

 their environment. 



The human foetus is cold blooded. 



1. Chemical changes associated with 

 oxidation. 



2. Friction of muscles, blood, etc. 



3. Ingestion of warm food. 

 Wherever metabohc changes are tak- 

 ing place. 



Offers large surface foi 

 radiation, conduction. 

 Skin 88 per j and evaporation of 

 cent I sweat. 



Contains large amount 

 Lost by \ [of blood. 



Lungs — 9 per cent is lost warming 

 the expired air and the evaporation 

 of the water of respiration. 

 Urine and Feces — 3 per cent is lost 

 warming the urine and feces. 

 Distributed — by the blood circulating through the blood 

 vessels. 



(Heat centres. 

 Sensory nerves. 

 Sweat nerves. 

 [ Vasomotor nerves. 



Produced by 



