Heart Physiology and Intrinsic Conduction System

The pacemaker of the heart

• AV node

• SA node

• Bundle of His

• Bundle branches

What does SA stand for?

• Sinoatrial

• Sinus attack

• Sanoatric

• Something awkward

What is another word for AV bundle?

• Bundle of HIS

• AV node

• Pacemaker

• Purkinje Fibers

Which is located within the walls of the ventricles?

• Purkinje fibers

• SA node

• AV node

• AV bundle and branches

Which is the correct path of electrical impulses through the heart?

• SA → Purkinje Fibers → Bundle Branches → AV
• SA → AV → Bundle Branches → Purkinje Fibers
• AV → SA → Bundle Branches → Purkinje Fibers
• AV → Bundle Branches → SA → Purkinje Fibers

Which is a pacemaker

• SA Node

• AV node

• AV bundle

• Purkinje Fibers

A cardiac cycle is:

• ventricular relaxation

• ventricular contraction

• equivalent to 1 complete heart beat

• a heart attack

Tags

NGSS.HS-LS1-3

What is the second step to heart contraction?

• Atria contract

• ventricles contract

• depolarization of SA node

• Impulse spreads throughout the atria

Which is diastole

• Atria relax and fill

• Ventricles contract and empty

• Semilunar valves are open/ AV valves are closed

• Atria contract and empty

Place the following in the correct order:
     1. atria contract
     2. AV node
     3. Bundle of His
     4. Purkinje fibers
     5. SA node
     6. ventricles contract

• 5, 1, 2, 3, 4, 6
• 2, 1, 5, 3, 4, 6
• 5, 6, 2, 3, 4, 1
• 2, 6, 5, 3, 4, 1