Heart - Heart Physiology Assigned reading Chapter 17 pp...

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Unformatted text preview: Heart Physiology Assigned reading: Chapter 17: pp. 607-623 Microscopic Anatomy Microscopic Anatomy Gap junctions Desmosomes Intercellular space Mechanism and Events of Cardiac Contraction Unique Characteristics of Heart Contraction: ► Stimulation by pacemaker cells or neighboring cardiomyocytes ► Not by neurons ► Long absolute refractory period ► No repeated stimulations allowed ► Whole organ contraction ► No motor units Control of electrical events: Pacemaker cells Mechanism and Events of Cardiac Contraction Skeletal Muscle Stimulation Cardiac Muscle Stimulation Mechanism and Events of Cardiac Contraction Control of electrical events: The Cardiac Conduction System Electrocardiogram ► Electrical activity of heart can be monitored from the skin ► Depolarization of the atria = p wave ► Depolarization of the ventricles = QRS complex Repolaization of the atria occurs too, but is smaller and is masked by ventricular electrical activity ► Repolarization of the ventrcles = T wave The Cardiac Cycle • Diastole = rest • Systole = contraction ►...
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This note was uploaded on 06/10/2010 for the course BIOL 252 taught by Professor Johnson during the Spring '07 term at UNC.

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Heart - Heart Physiology Assigned reading Chapter 17 pp...

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