EKG pretest

Electrical impulses in the heart originate in a group of nerve cells in the right atrium called the:

• Bundle of HIS

• Sinoatrial node

• Atrioventricular node

• Purkinje fibers

During the P wave, what is happening?

• Atrial repolarization

• Ventricular repolarization

• Atrial depolarization

• Ventricular depolarization

The ability to respond to an impulse is called:

• contractility

• excitability

• conductivity

• Automaticity

A thrombus that breaks loose and travels in the bloodstream is called:

• an infarct

• necrotic tissue

• aneurysm

• an embolus

During QRS, what is happening

• Atrial depolarization

• ventricular depolarization

• Ventricular repolarization

• Atrial repolarization and ventricular depolarization

Lead V2 visualizes:

• Right bundle branch system.

• Left anterior surface of the heart.

• Right anterior surface of the heart.

• Right anterior septal surface.

The ability to transmit an impulse is called

• contractility

• Automaticity

• conductivity

• excitability

During T wave, what valves are opened?

• Semilunar valves which are pulmonic and aortic valve

• Atrioventricular valves which are bicuspid and tricupsid valve

• Semilunar valves are Bicuspid and tricupsid

• Atrioventricular valves are Pulmonic valve and aortic valve

Stimulation of these fibers in the heart causes the ventricles to contract:

• Sinoatrial node

• Purkinje fibers

• Atrioventricular node

• Bundle of HIS

The ability to spontaneously generate an impulse is called:

• Automaticity

• conductivity

• contractility

• excitability