Download - The heart conduction system
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Lloyd Dean
The Heart
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Test Time!
Click here to start
Can You Label The Heart?
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Click on the
Left Atrium
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Click on the
Left Ventricle
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Click on the
Tricuspid Valve
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Click on the Aortic and
Pulmonary Valves
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Click on the
Right Atrium
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Right Ventricle
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Click on the
PulmonaryVeins
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Click on the
Pulmonary Artery
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Click on the Aorta
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Vena Cava
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GameOver
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Cardiac OutputWhat is it?
The amount, or volume, of blood pumped by the heart per minute (mL blood/min)
Heart rate and Stroke Volume make this up
Heart rate (HR) – beats per minute
Stroke Volume (SV) – Millilitres (mL) of blood pumped out with each beat.
Cardiac Output = HR x SV
An average person has a resting heart rate of 70 beats a minute and a resting stroke volume of 70mL/beat
Work out their cardiac output
CO = HR x SV CO = 70 x 70CO = 4900 mL/minute
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Conduction SystemThe hearts atria, and then ventricles, need to contract
simultaneously
Conduction system includes several components;
Sinoatrial (SA) node – Found in the myocardium at the top of right atrium
SA node is commonly know as the heart’s pacemaker
Each electrical impulse travels through the muscle fibres of the atria and ventricles, causing them to contract
Atrioventricular (AV) node delays the electrical impulse to allow the atria to contract and empty all blood
AV node is an electrical relay station that sends an impulse through the ventricles along special fibres called “His-Purkinje” fibres.
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