Intro, Pathophysiology

The conduction system is made up of pacemaker cells and contractile cells

• true

• false

Which of the following are pacemaker cells?

• sinoatrial (SA) node

• atrioventricular (AV) node

• cardiac myocytes

Which of the following are contractile cells?

• sinoatrial (SA) node

• atrioventricular (AV) node

• cardiac myocytes

Communicate through gap junctions

• pacemaker cells

• contractile cells

Which of the following are true about signal transmission?

• Atria and ventricles contract independently

• signal only enters ventricles through AV node

• signal only enters ventricles through SA node

Serves as a pacemaker

• SA node

• AV node

Signal is delayed at

• SA node

• AV node

After the SA node spreads its signal, _____ contracts

• atria

• ventricle

After the AV node spreads its signal, conduction then spreads rapidly and uniformly and _______ contracts

• atria

• ventricles

Which of the following electrolyte channels polarizes?

• potassium (K+)

• sodium (Na+)

• calcium (Ca2+)