Cardiac Conduction and ECG

Front

What is the function of the SA Node in the cardiac conduction system?

Back

The SA Node, or sinoatrial node, is the natural pacemaker of the heart that initiates the electrical impulse causing the heart to contract.

Front

What does the AV Node do in the cardiac conduction system?

Back

The AV Node, or atrioventricular node, receives the electrical impulse from the SA Node and delays it before passing it to the ventricles, allowing for proper filling of the heart.

Front

What is the role of the Bundle of His?

Back

The Bundle of His, or atrioventricular bundle, conducts impulses from the AV Node to the ventricles, facilitating coordinated contraction.

Front

What are Purkinje Fibers?

Back

Purkinje Fibers are specialized fibers that distribute the electrical impulse throughout the ventricles, leading to their contraction.

Front

What occurs during the P-wave of an ECG?

Back

The P-wave represents atrial depolarization, which is the electrical activity that triggers the contraction of the atria.

Front

What does the QRS complex represent in an ECG?

Back

The QRS complex represents ventricular depolarization, which is the electrical activity that triggers the contraction of the ventricles.

Front

What is happening during the T-wave of an ECG?

Back

The T-wave represents ventricular repolarization, which is the process of the ventricles recovering after contraction.

Front

What is depolarization in the context of cardiac function?

Back

Depolarization is the process by which cardiac muscle cells become electrically activated, leading to contraction.

Front

What is repolarization in the context of cardiac function?

Back

Repolarization is the process by which cardiac muscle cells return to their resting state after contraction.

Front

How does the autonomic nervous system influence heart rate?

Back

The autonomic nervous system regulates heart rate through sympathetic stimulation (increasing heart rate) and parasympathetic stimulation (decreasing heart rate).