| Term 
 | Definition 
 
        | These carry blood AWAY from the heart. |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | They RETURN blood to the heart. |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | The two chambers on the top part of the heart. These chambers fill with blood that is returning to the heart from the body and lungs. |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | The two chambers on the bottom part of the heart. These chambers send the blood to the body and the lungs. |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | Separates the left side and the right side of the heart. |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | Lets blood in and keeps it there by closing. |  | 
        |  |