LO 1

Which of the following is the primary pacemaker of the heart?

• AV node

• Purkinje fibers

• SA node

• Bundle of His

Which of these correctly represents the normal conduction pathway of electrical impulses in the heart?

• SA node → AV node → Bundle of His → Purkinje fibers

• AV node → SA node → Purkinje fibers → Bundle of His

• SA node → Purkinje fibers → AV node → Bundle branches

• AV node → Bundle of His → SA node → Purkinje fibers

The Bundle of His is located

• In the walls of the atria

• In the interventricular septum

• In the pulmonary artery

• In the sinoatrial node

Which component delays the impulse to allow ventricular filling?

• SA node

• AV node

• Bundle branches

• Bundle branches
  

The Purkinje fibers conduct impulses rapidly to all parts of the ventricles.

• True

• False

The sinoatrial node is located in the left atrium.

• True

• False

The ___ node is known as the natural pacemaker of the heart.

Electrical impulses travel from the Bundle of His into the right and left ___ branches.