The small bump representing the first interval in a cardiac complex represents:%0D%0A%0D%0A(1 point)%0D%0AResponses%0D%0A%0D%0Aatrial polarization.%0D%0A%0D%0Aatrial polarization.%0D%0A%0D%0Aventricle polarization.%0D%0A%0D%0Aventricle polarization.%0D%0A%0D%0Aatrial depolarization.%0D%0A%0D%0Aatrial depolarization.%0D%0A%0D%0Aventricle depolarization.%0D%0A%0D%0Aventricle depolarization.

The small bump representing the first interval in a cardiac complex represents atrial depolarization.