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3.1.2 The Cardiac Cycle (Electrocardiogram (ECG) traces (normal,…
3.1.2 The Cardiac Cycle
Heart
Structure
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atria: thin walls compared to ventricles; do not ned to create as much pressure as blood is only pumped to ventricles
ventricles: thick walls; left wall is thicker than the right wall, more pressure is needed to pump blood around whole body; right ventricle only pumps blood to lungs
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Valves
atrio-ventricular valves: valves between atria and ventricles; ensure blood flows in correct direction
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Cardiac Cycle
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Diastole
musclular walls of all four chambers relax and elastic recoil allows chambers to increase in volume and fill with blood
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