According to the research, the p wave on an electrocardiogram (ecg) represents the first wave of the cardiac cycle which is the atrial electrical depolarization.
<h3>What is an electrocardiogram?</h3>
It is the graph that records the electrical activity of the heart and allows the diagnosis of different cardiovascular diseases and helps to know the state of the heart muscle.
It presents a P wave (corresponding to atrial depolarization), a QRS complex (ventricular depolarization), and a T wave (ventricular repolarization).
Therefore, we can conclude that according to the research, the p wave on an electrocardiogram (ecg) represents the first wave of the cardiac cycle which is the atrial electrical depolarization.
Learn more about  an electrocardiogram here: brainly.com/question/15093448
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The correct option is D, that is, YOUR INSURANCE POLICY WILL LIKELY NOT COVER THE DAMAGES TO YOUR CAR.
A comprehensive car insurance is a type of car insurance which cover other damages to your car with the exception of collision. Comprehensive car insurance only cover damages that occur as a result of vandalism, disaster, theft, fire, etc,; it does not cover damages due to accident collision.
        
                    
             
        
        
        
Answer:
The missing options are:
a.lining the pharynx 
b.lining the trachea 
c.within the walls of the alveoli 
d.You would find epithelial cells in all of the listed answer choices.
The correct answer is d. You would find epithelial cells in all of the listed answer choices.
Explanation:
Epithelial cells are in all the options mentioned above because they are the ones that form the tissue of the respiratory system, and that form a barrier between the exterior and the interior of the body as a mechanism of protection. They also are in the skin or the urinary system. 
 
        
             
        
        
        
Not having your germy hands on people's food.