RESPIRATION 255 



188. THE BLOOD 



The blood serves as a carrier of food and oxygen to all parts 

 of the body. It is the builder and also the cleanser of the 

 system. In the digestive organs the blood takes up the newly 

 prepared body food and distributes it to all the living cells, 

 in every part of the body. The oxygen, which the blood 

 receives in the lungs, is also carried to every cell, by means 

 of red corpuscles, where it burns up the waste material, chang- 

 ing it into such a shape that it can be carried to the lungs, 

 where it is exhaled as carbon dioxide and decayed animal 

 matter, and to the perspiratory glands, where it is carried off 

 mechanically. The kidneys absorb other waste from the 

 blood. 



The white corpuscles serve as protective agents, destroying 

 bacteria which enter through a broken skin. 



References : 



1. 1501 : 156-161. The Blood. 



2. 1501 : 161-169. The Heart. 



3. 1503:344-349. The Blood. 



4. 1503 : 392-394. The Human Kidney. 

 a. 1505 : 52-69. The Circulation. 



6. 1506 : 106-113. The Blood and its Uses. 



c. 1507 : 126-127. White Blood Corpuscles. 



d. 1509 : 135-152. The Circulation of the Blood. 



e. 1509 : 196-199. The Removal of Waste Products. 

 /. 1510 : 67-86. Circulation. 



g. 1511 : 75-105. The Blood and its Circulation. 



189. RESPIRATION 



The material in the blood must receive a sufficient supply of 

 oxygen in order that the waste material may be consumed. 

 The lungs supply this need, and man inhales about thirty^ 



