In an EKG,the P wave is generated when the
A)ventricles depolarize.
B)atria depolarize.
C)atria repolarize.
D)ventricles repolarize.
E)SA node initiates an impulse.

Question

Quizplus · Accepted Answer

The P wave represents atrial depolarization, which is the electrical stimulation of the atria that causes them to contract.

Answer: E 
 The SA (sinoatrial) node is located in the right atrium and is responsible for initiating the heartbeat by generating an electrical impulse. This impulse causes the atria to depolarize, producing the P wave on an EKG.

In an EKG,the P Wave Is Generated When the