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

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.

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)

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

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

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

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

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

A irregular heartbeat or rhythm.

A normal heart rhythm but with a rate below 60bpm. This condition is common with athletes.

A normal heart rhythm but with a rate above 100bpm.

a condition in which a irritable piece of atrial heart tissue fires before the SA node. This causes the contraction to occur too early in the rhythm. Usually they are harmless, caffeine and other stimulants can increase their likelihood.

A condition in which the atrial tissue is very irritated, causing the atria to beat at a rate greater than 350bpm. The atria don’t beat in a coordinated manner, they simply quiver. On the ECG it is represented as a wavy line and the rhythm is irregular.

A condition in which Purkinje fibers fire before the SA node, causing the ventricles to contract prematurely.

A life threatening arrhythmia in which the ventricles, rather than the SA node initiate the beat. The heart rate is between 150 and 250 bmp, requiring immediate medical intervention

A life threatening condition in which the ventricles quiver at a rate greater than 350bpm. Essentially there is no cardiac output. Defibrillation is needed to re-start the heart in the hope it regains its normal rhythm.

A condition in which the impulses traveling from the SA node to the ventricles are delayed, or blocked intermittently, or completely blocked by the AV node.

A device that can deliver a therapeutic dose of electrical current that momentarily stops the heart, allowing its built-in pacemaker, the SA node to assume control and produce a normal rhythm.