The ventricles contract.
QRS
A QRS wave is caused by the depolarization of the ventricles of the heart, which leads to the contraction of the ventricles and the pumping of blood out of the heart. The QRS complex represents the electrical activity associated with this depolarization.
The QRS complex corresponds to the depolarization of the ventricles in the heart. It represents the spread of the electrical signal that initiates the contraction of the ventricles. This is a critical step in the cardiac cycle that leads to the pumping of blood out of the heart.
Type your answer here... abnormally slow depolarization of the ventricles would most change the shape of the ?in an ekg tracing
Depolarization of ventricles
An Electrocardiogram of a single heart beat shows three distinct waves. These are the P, QRS and T Waves. The QRS wave (normally the largest spike) in the electrocardiogram, is that of the ventricles depolarizing and contracting.
Repolarization of ventricular muscle fibers.
Right and left atrial depolarization produce a P wave on an electrocardiogram (ECG) waveform. This represents the depolarization of the atria as they contract to push blood into the ventricles.
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Arterial depolarization occurs when action potentials are generated in the cardiac cells of the heart during the electrical conduction system, leading to the contraction of the heart muscle. This depolarization occurs as the electrical signal travels through the atria and then the ventricles, causing them to contract and pump blood.
The QRS complex is normally larger than the P Wave because depolarization of the larger muscle mass of the ventricles generates more voltage than does depolarization of the smaller muscle mass of the atria
There are a number of things that may happen during the QRS wave. There will be ventricular depolarization and right after absolute refractory period for ventricles will occur.