18 - Cardiac Conduction System #1

Network found in the ventricular myocardium

• Purkinje fibers

• AV node

• AV bundle

• SA node

Found in the interventricular septum

• AV bundle

• AV node

• SA node

• Purkinje fibers

The P wave of a normal electrocardiogram indicates:

• Atrial depolarization

• Atrial repolarization

• Ventricular depolarization

• Ventricular repolarization

The pacemaker cells of the heart are located in the:

• SA node

• Purkinje fibers

• Wall of the left ventricle

• AV node

• Both the left and right ventricles

The tricuspid valve is closed:

• When the ventricle is in systole

• While the ventricle is diastole

• While the atrium is contracting

• By the movement of blood from atrium to ventricle

The deflection waves in an EKG include:

• The T wave, which indicates ventricular repolarization.

• The P wave, which is present only in patients who have had a heart attack

• The Q-T interval, which indicates the time of atrial contraction

• The PQRS complex, which follows ventricular contraction

Blood enters which of these vessels during ventricular systole?

• Aorta &Pulmonary arteries

• Aorta

• Pulmonary vein

• Superior vena cava

• Pulmonary Artery & Inferior vena cava

The heart beats approximately ___ times a day.

• 100,000

• 1,000

• 10,000

• 1,000,000

• 1,000,000,000

Tags

NGSS.HS-LS1-3

___ is to slow heart rate as ___ is to fast heart rate

• bradycardia; tachycardia

• tachycardia; bradycardia

• bradycardia; cardiomyopathy

• cardiac tamponade; bradycardia

• none of the above

Tags

NGSS.HS-LS1-3

In an EKG, the electrical activity associated with atrial repolarization (relaxation) is usually obscured by the QRS complex

• True

• False