The answer is Na + is entering the cell and the K + is leaving, during the depolarization phase of the action potential open Na + channels allow Na + ions to diffuse into the cell. This inward movement of positive charge makes the membrane potential more positive. The depolarization phase is a positive response sequence where open Na + channels cause depolarization which in re-occurrence causes more voltage gated Na+ channels to open. 
        
             
        
        
        
Answer:
carbohydrates
Explanation:
 
Organic molecules composed of carbon, hydrogen, and oxygen in a ratio of 2-hydrogen atoms to every 1 oxygen atom.
 
        
             
        
        
        
C. <span>The duodenum is a separate anatomic structure. It is the first part of the small intestine after the stomach. </span>
        
                    
             
        
        
        
C. light-years is the best to describe the distance
        
             
        
        
        
Answer:
See Explanation
Explanation:
There is no physical way to explain how to do this on this website.
Sorry Though!