Cardiac arrest is when it has completely stopped. It’s different from afib or vfib. So when you have a slow weak pulse, you still have a pulse there. So that’s wrong. Cyanosis is lack of oxygen to the body. Agonal gasps (if I remember it correctly) is the body letting air out and is definitely a sign of cardiac arrest. And again, if the pulse is still present, it may develop into cardiac arrest, but is not yet. So your answer is C. Agonal gasps
 
        
                    
             
        
        
        
Answer:
Adenosine. 
Explanation:
Adenosine is a neurotransmitter that is created in the brain and when it binds to the adenosine receptors, it slows down nerve activity and it creates a sensation of drowsiness.
<u>Caffeine</u> looks like adenosine to the receptors, therefore, when we have caffeine, <u>it binds to these receptors and there is no room left for the adenosine to bind</u>. However, the caffeine doesn't slow down nerve activity but, in the contrary, it speeds it up. 
Therefore we can tell that caffeine blocks the receptors for the adenosine thus promoting wakefulness. 
 
        
             
        
        
        
Answer:
<u><em>Digestion</em></u>
Explanation:
Hope this helps:)
 
        
                    
             
        
        
        
The rhythmic sequence at which your heart beats is called a sinus rhythm, it is when the atria and ventricles of the heart contract.