Cardiac Conduction System 1 Conduction System of Heart

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Cardiac Conduction System

Cardiac Conduction System

(1) Conduction System of Heart • Conduction System = Heart Beat & Pumping •

(1) Conduction System of Heart • Conduction System = Heart Beat & Pumping • Cardiac Contractions = Unconscious – Autonomic Nervous System decrease or increase heart rate depending on circumstance

(2) Depolarization of the Heart • Generate Action Potential & Depolarization: – Atria Ventricles

(2) Depolarization of the Heart • Generate Action Potential & Depolarization: – Atria Ventricles • Depolarization Path: 1. 2. 3. 4. SA Node AV Node Atria Contract (Delay) AV Bundle Ventricles Contract (Blood ejected out of arteries, leaving heart)

http: //highered. mcgrawhill. com/sites/0072495855/student_view 0/chapter 22/ani mation__conducting_system_of_the_heart. html

http: //highered. mcgrawhill. com/sites/0072495855/student_view 0/chapter 22/ani mation__conducting_system_of_the_heart. html

(3) Nodes & Bundles • Sinoatrial Node (SA Node) – Right atrium – Starts

(3) Nodes & Bundles • Sinoatrial Node (SA Node) – Right atrium – Starts each heart beat & sets rate – “Pacemaker” • Atrioventricular Node (AV Node) = Left atrium • AV Bundle = – Bundle Branches (along septum) – Purkinje Fibers (along entire muscular wall of heart)

(4) Cardiac Cycle • Diastole = Relax – Blood passively filling atria • Systole

(4) Cardiac Cycle • Diastole = Relax – Blood passively filling atria • Systole = Contract – Ventricles contract – Blood Ejected out of heart

(5) Diastole 1. Ventricles relax 2. Semilunar valves closed 3. Ventricular Presure < Atrial

(5) Diastole 1. Ventricles relax 2. Semilunar valves closed 3. Ventricular Presure < Atrial Pressure – AV valves open – Ventricles fill with blood 4. Atria contract and force blood remaining in chambers into ventricles

(6) Systole 1. Pressure increases in ventricles - Filled with blood 2. AV valves

(6) Systole 1. Pressure increases in ventricles - Filled with blood 2. AV valves close 3. Pressure in ventricles > Arteries leaving heart - Semilunar valves open Blood rushes out of ventricles 4. Atria are relaxed and begin to fill back up

(7) Heart Beat • You hear something like “lub” “dup” – “lub” = closing

(7) Heart Beat • You hear something like “lub” “dup” – “lub” = closing of AV valves • During ventricular systole – “dup” = closing of semilunar valves • During early diastole • You should NOT hear blood flow – You’ll hear it if flow is interrupted by blockage http: //www. csulb. edu/org/college/bme/respiratory _sounds/heart. wav

(8) Cardiac Output • Cardiac Output – Amount of blood pumped out by each

(8) Cardiac Output • Cardiac Output – Amount of blood pumped out by each ventricle / 1 minute – Cardiac Output = Heart Rate x Stroke Volume – CO = (HR)(SV) • Stroke Volume – Volume of blood pumped out by ventricle – Increase of SV = Increase of ventricular force + contraction • Average Stroke Volume = 0. 2 L • Average Cardiac Output = 15 L/min

(9) Starling’s Law • Starling’s Law of the Heart: – Degree of cardiac muscle

(9) Starling’s Law • Starling’s Law of the Heart: – Degree of cardiac muscle extension before contraction – Increase Extension = Stronger Contraction – Degree of Extension result of percent filling of ventricles

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