Answer:
"It is the enzyme that breaks down acetylcholine in the synaptic cleft, ending stimulation of the muscle fiber. -It is the type of receptor found in the motor end plate that binds acetylcholine, initiating an electrical impulse."
Explanation:
 
        
             
        
        
        
Answer:
<h2>Jupiter, earth ,venus,Mars, Uranus </h2>
 
        
             
        
        
        
The least reactive element in the third period is argon.
        
             
        
        
        
Answer:
a. iris 
Explanation:
iris is actually the structure of the eye that regulates the amount of light passing to the visual receptors of the eye