Answer:
If your feeling down then get up
Explanation:
 
        
                    
             
        
        
        
There are two phases of the cardiac cycle. These phases are diastole and systole. The dicrotic notch is found during systole, specifically ventricular systole.
Systole is the time when <span>left and right ventricles contract and eject blood into the aorta and pulmonary artery. 
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Diastole is the time when the ventricles are not contracting or are in a relax mode.
        
             
        
        
        
B, weakens the immune system