Cardiac Conduction

Front

What is the function of the SA Node in the heart?

Back

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

Front

What happens during depolarization of the heart muscle?

Back

During depolarization, the heart muscle contracts, allowing blood to be pumped out of the heart.

Front

What is the role of the AV Node in cardiac conduction?

Back

The AV Node, or atrioventricular node, receives impulses from the SA Node and delays them before passing them to the ventricles, ensuring proper timing of heart contractions.

Front

What is the QRS complex in an ECG?

Back

The QRS complex represents the depolarization of the ventricles, which is the main pumping action of the heart.

Front

What occurs if there is a blockage in the AV bundle?

Back

If there is a blockage in the AV bundle, the Purkinje fibers may not receive impulses, leading to ineffective ventricular contraction.

Front

What is repolarization in the context of cardiac function?

Back

Repolarization is the process where the heart muscle relaxes after contraction, preparing for the next heartbeat.

Front

True or False: The heart muscle is at rest during depolarization.

Back

False. The heart muscle contracts during depolarization.

Front

What does depolarization result in?

Back

Depolarization results in contraction of the heart muscle.

Front

Where is the AV Node located?

Back

The AV Node is located at the junction of the atria and ventricles in the heart.

Front

What is the significance of the Purkinje fibers?

Back

Purkinje fibers are specialized fibers that conduct electrical impulses rapidly throughout the ventricles, ensuring coordinated contraction.