Intro to Cardiac Cycle (Electrical Activity)

What do the letters EKG or ECG stand for?

• Electrocardiograph
• Electromagneticgraph
• Electrocardiogram 
• Cardiac Ultrasound

An ECG or EKG measures what?

• The amount of pressure exerted on blood vessels.
• The electrical activity of the heart.
• Cardiac blood flow.

• Electrical impulses of the nervous system

The p-wave correlates with which event?

• Atria contracting

• Ventricular contraction

• Ventricular depolarization

• Atria repolarization

Considered the pacemaker of the heart

(A in the image)

• Sinoatrial node

• right ventricle

• atrioventricular node 

• left ventricle

Identify B in the image

• Sinoatrial node

• Interartial Pathway

• atrioventricular node 

• Internodal pathway

The t-wave correlates with which event?

• Electrical activity from SA --> AV node

• ventricle depolarization

• ventricle repolarization
• Atrial contraction

The QRS-wave correlates with which event?

(multiple correct answers)

• Blood leaving the atria, entering the ventricles

• Ventricular depolarization

• Atria repolarization

• Signal passing along intranodal pathways

• Blood retuning from the body and lungs

Reorder according to the cardiac conduction cycle pathway

• SA Node --> Internodal & Interatrial pathways

• bundle of His

• R & L Bundle branches

• AV Node

• Purkinje Fibers

P wave is

• Repolarization of atria

• Repolarization of ventricles

• Depolarization of atria

• Depolarization of ventricles

T wave is

• Repolarization of atria

• Repolarization of ventricles

• Repolarization of ventricles and atria

• Depolarization of atria and ventricles