The Pacemaker of The Heart

What is the electrical signal that starts each beat of the heart?

• P wave

• S wave

• SA node

• T wave

Where is the SA node located?

• Heart's right atrium

• Heart's right ventricle

• Heart's left atrium

• Heart's left ventricle

What does the P wave on the EKG represent?

• Relaxation of heart's ventricles

• Contraction of heart's ventricles

• Release of the signal from the bundle of his

• Contraction of heart's atria

What is the function of the AV node?

• To slow down the electrical signal

• To mark the contraction of the heart's ventricles

• To release the electrical signal

• To spread the electrical signal

Where does the signal go after leaving the AV node?

• Bundle of his

• Purkinje fibers

• Left and right bundle branches

• SA node

What does the R wave on the EKG mark?

• Contraction of heart's right ventricle

• Relaxation of heart's ventricles

• Spread of the signal across the cells of the ventricle walls

• Contraction of heart's left ventricle

What happens when the signal spreads across the cells of the ventricle walls?

• Both ventricles contract but not at the same moment

• Both ventricles contract an instant before the atria

• Both ventricles contract at the same moment

• Both ventricles relax

What does the S wave on the EKG mark?

• Contraction of heart's ventricles

• Relaxation of heart's ventricles

• Contraction of heart's atria

• Release of the signal from the bundle of his

Where does the contraction of the heart's right ventricle push blood to?

• Rest of the body

• Lungs

• Stomach

• Brain

Where does the contraction of the heart's left ventricle push blood to?

• Rest of the body

• Stomach

• Brain

• Lungs