10 terms

Cardiology Cardiac Conduction, Cycle

Cardiology Module 12, Lesson 7; Cardiac Conduction and Cardiac Cycle
cardiac conduction
electrical impulses generated by specialized nodal tissue that travel through the heart wall

causing the myocardium to contract the heart chambers in a coordinated fashion
sinoatrial (SA) node
fires an electrical impulse that travels through the walls of the atria, signaling both the atria to contract and push blood into the ventricles

lies in the upper right atrium

sends impulse to the AV node
atrioventricular (AV) node
receives impulse from SA noded

lies between the atria and the ventricles

holds the electrical impulse for a fraction of a second allowing the atria to relax

sends the impulse down to the atrioventricular bundle
atrioventricular bundle (Bundle of His)
receives impulse from AV node

branches into the Purkinje fibers at the bottom of the ventricles
Purkinje fibers
signal both the ventricles to contract and push blood out to the lungs and to the rest of the body
cardiac cycle
the events that occur when the heart beats
heart beat
when the atria contract at the same time as the ventricles relax

beats about 60-80 times per minute
sinus rhythm
sequence of contraction and relaxation of the heart chambers
refers to the contraction of the chambers
refers to the relaxation of the ventricles