Cardiovascular System

What prevents blood from flowing back into the atria when the ventricles contract?

• semilunar valves

• sinoatrial node

• atrioventricular node

• tricuspid and bicuspid valves

When blood leaves this chamber of the heart, it heads out to the body (not the lungs)

• left atrium

• right atrium

• left ventricle

• right ventricle

This initiates the action potential that causes the heart to beat

• Inferior vena cava

• Atrioventricular node (AV node)

• Superior vena cava

• Sinoatrial node (SA node)

When blood leaves this chamber of the heart, it heads to the lungs

• right atrium

• right ventricle

• left atrium

• left ventricle

This stops blood from flowing back into the ventricles each time they contract

• semilunar valves

• tricuspid and bicuspid valves

• Sinoatrial node (SA node)

• Aorta

This is responsible for distributing electrical impulses through the heart

• Atrioventricular node

• Sinoatrial node

• Inferior vena cava

• Superior vena cava

The average blood pressure is 

• 120/80
• 80/120
• 115/180
• 120/180

P Wave

• SA Nodes contracts

  Both atria contracts

• Impulses reach the av node 0.10 delay allows

• Repolarization or recovery of the ventricles

• Impulses hit av bundle branch off into two bundles down front of heart into purkinje fibers

QRS

• Repolarization or recovery of the ventricles

• Impulses hit av bundle branch off into two bundles down front of heart into purkinje fibers

• SA Nodes contracts

  Both atria contracts

• Impulses reach the av node 0.10 delay allows atria

The p-wave correlates with which event?

• atrium contraction /signals moving from SA node to AV node
• ventricle contraction
• ventricle repolarization
• both atrial and ventricle contraction