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Cardiac Cycle, Shier, D., Butler, J., & Lewis, R. (2016). Hole's…
Cardiac Cycle
Produces one heartbeat
Two alternating phases
Systole
Heart is contracting
Chamber is relaxing
Diastole
Heart is ejecting blood
Chamber is filling
Controlled by conduction system
Generates stimulus
For heart muscle contraction
SA node
Internodal pathway
AV node
AV bundle
Bundle branches
Purkinje fibers
Stimulates ventricular muscle cells
Carries stimulus to ventricles
Located at top of intraventricular septum
Located at junction of atria and ventricles
Carries stimulus throughout atria
The heart pacemaker
Shier, D., Butler, J., & Lewis, R. (2016). Hole's Human Anatomy & Physiology (14th ed., pp. 568-573).