Comprehension Check Electrical Conductivity of the Heart

The valves between the atria and ventricles are known as the ________ valves.

• atrioventricular

• sinoatrial

• semilunar

• pulmonary

Which label is representing the Purkinje fibers?

• A

• C

• D

• E

• B

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

• Purknife fibers

• SA node

• Bundle of his

• Interventricular Septum

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

• SA node

True or False: The AV node 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

Because the SA node initiates 1 cardiac cycle, it fires at a rate of

• 40-60 bpm

• 80-90 bpm

• 60-80 bpm

• 60-100 bpm

What part of the heart's electrical system is known as the "gatekeeper" because it delays the electrical impulse?

• AV node

• Gap junction

• Purkinje Fibers

• SA node

What is happening in the P-wave of an EKG?

• Atria relaxes because the AV node fired a signal

• Atria contracts because the AV node fired a signal

• Atria contracts because the SA node fired a signal

• Atria relaxes because the SA node fired a signal

True and False: The SA node is located in the left atrium.

• True

• False