Cardiac Conduction System

Question 0

Autorhythmic fibers

Answer 0

Self-excitable, repeatedly generated action potentials that trigger heart contractions

Question 1

Cardiac conduction system

Answer 1

A network of specialized cardiac muscle fibers that provide a path for each cycle of cardiac excitation to progress through the heart

Question 2

Arrhythmias

Answer 2

The heart beats irregularly, too fast or too slow

Question 3

Contractile fibers

Answer 3

Are a conduction system and spreads out to excite the working atrial and ventricular muscle fibers

Question 4

Refractory period

Answer 4

Is the time interval, during which a second contraction cannot be triggered.

Question 5

Electrocardiogram

Answer 5

Is a recording of the electrical activity that initiates each heart beat.

Question 6

Systole

Answer 6

The phase of contraction

Question 7

Diastole

Answer 7

The phase of relaxation

Question 8

Cardiac action potentials propagate through the conduction system in the following sequence

Answer 8

1) cardiac excitation begins in the sinoatrial node, which is located in the right atrial wall. 2) the action potential reaches the atrioventricular node, which is located in the interatrial septum, 3) the action potential enters the atrioventricular bundle, also known as the bundle of His. 4) the action potential enters both the right and left bundle branches which extend through the interventricular septum toward the apex of the heart 5) the action potential is conducted by the large-diameter purkinje fibers, which begins at the apex of the heart upward to the ventricular myocardium; then the ventricles contract.

Question 9

What is the natural pacemaker which sets the rhythm for contraction of the heart.

Answer 9

Sinoatrial node

Question 10

The electrocardiogram is abbreviated

Answer 10

ECG or EKG

Question 11

The electrocardiogram is a record of action potentials produced by

Answer 11

The ventricular contraction