Electrical Parts of the Heart

Another name for the pericardium layer is the

• myocardium

• endocardium

• epicardium

The muscular middle layer of the heart is called the

• epicardium

• myocardium

• pericardium

• endocardium

The heart layer that keeps blood from sticking to the inside of the heart and forming potentially deadly blood clots is called

• endocardium

• pericardium

• myocardium

• epicardium

What area of the heart's electrical conduction is known as the "pacemaker" of the heart?

• Purknife fibers

• SA node

• Bundle of his

• Bachmann's bundle

What area of the heart is responsible for the delay of conduction between the atrium and ventricles?

• Right bundle branch

• AV node

• Bundle of his

• Bachmann bundle

True or False: Bachmann's bundle is located in the left atrium.

• True

• False

True or False: Depolarization of the heart muscle is when the muscle contracts and repolarization is when the heart muscle rests.

• True

• False

The SA node fires at a rate of

• 40-60 bpm

• 80-90 bpm

• 60-80 bpm

• 60-100 bpm

On an EKG, the P-wave represents what area of the heart?

• Left bundle branch

• AV node

• SA node

• Bachmann's bundle

What part of the heart's electrical system is known as the "gatekeeper?"

• AV node

• Gap junction

• Tetany

• SA node