A small mass of specialized tissue located in the right atrium of the heart that acts like the pacemaker of the heart. (Area #1)

• sinoatrial node (SA node)

• atrioventricular node (AV node)

• purkinje fibers

• bundle of His

A small mass of tissues that transmit impulses received from the sinoatrial node to the ventricles via the bundle of His (Area #2)

• sinoatrial node (SA node)

• atrioventricular node (AV node)

• purkinje fibers

• bundle of His

Pressure sensitive nerve endings in the atrium, aortic arch and carotid artery, they send information back to the cardiac center stimulating either the sympathetic or parasympathetic branches to regulate heart rate.

• sinoatrial node (SA node)

• atrioventricular node (AV node)

• purkinje fibers

• baroreceptors

A slender bundle of cardiac muscle that conducts electrical impulses from the AV node to the left and right bundle branches to the purkinje fibers in the ventricle. (Area #6)

• purkinje fibers

• left bundle branches

• bundle of His

• sinoatrial node (SA node)

The left limbs or branches through which electrical impulses are transmitted from the bundle of His through the left ventricle. (Area #4)

• left bundle branches

• right bundle branches

• purkinje fibers

• bundle of His

Electrical impulses from the bundle of His are transmitted through the right ventricle through this... (Area #4)

• left bundle branches

• right bundle branches

• purkinje fibers

• bundle of His

Part of the impulse conducting network of the heart that rapidly transmits impulses through the ventricles causing ventricular contraction. (Area #3)

• left bundle branches

• right bundle branches

• purkinje fibers

• bundle of His

To contract the atriums and ventricles, they do this as the heart beats...

• polarize

• depolarize

• repolarize

• ventriculate

To relax, the atrium and ventricles do this as the heart beats.

• polarize

• repolarize

• depolarize

• ventriculate

A irregular heartbeat or rhythm.

• polarization

• depolarization

• arrhythmia

• fibrillation