The answer is Adrenaline
Adrenaline is a stress hormone secreted by the adrenal glands and some other neurons when a person is frightened, excited or generally in stress.
It prepares our body for it's 'fight or flight' mechanism and tightens muscles for exertion.
After a bank robbery, most people feel a rush of adrenaline.
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Sensory receptors is the answer I found
        
                    
             
        
        
        
Answer:
B
Explanation:
BBBBBBBBBBBBBB BBBBBBBBBBBB THE ANSWER I THINK IS B
 
        
             
        
        
        
Hair and nails are part<span> of the integumentary </span>system<span>.</span>