16 HUMAN PHYSIOLOGY CHAP, n 



SUMMARY OF THE MAIN POINTS 



1. Each living, working cell of the human body is sur- 

 rounded by lymph which contains the food for the cells, and 

 the wastes of the cells. 



2. The blood receives solid foods, water, and oxygen and 

 carries them to the lymph, and removes from the lymph the 

 wastes of the cells. 



3. The mass color of blood is bright red, but a small 

 amount as seen under a microscope is pale yellow. 



4. The blood is made up of red and white corpuscles and 

 plasma. 



5. The red corpuscles are oxygen carriers, and the white 

 ones destroy disease germs that get into the blood, and aid in 

 blood clotting. 



6. The average person has from ten to twelve pounds of 

 blood, and a much larger quantity of lymph. 



7. One fourth of the blood is in the heart, lungs, and large 

 blood vessels ; one fourth in the liver ; one fourth in the 

 muscles ; and one fourth in the other organs. 



8. The blood clots when exposed to the air, and so tends 

 to prevent great loss of blood from wounds. 



9. Anaemia is due to a lack of coloring matter in the blood. 

 10. The general health depends upon the condition and 



amount of blood. 



