One of the possible answers is sickle cell.
 
        
        
        
A. Veins 
B. <span>Arteries
C. </span><span>Capillaries</span>
        
             
        
        
        
Answer:
B. Hypothalamus
Explanation:
Hypothalamus controls all the aforementioned functions. A tumor caused a reduces functionality
 
        
                    
             
        
        
        
The cells are producing carbon dioxide and water. By taking in oxygen, the one performing cellular respiration releases carbon dioxide into the air.