| Front | Starting with the heart full of blood outline the stages of the cardiac cycle. ( 5 marks) |
|---|---|
| Back | atria contract/atrial systole occurs; forces blood into ventricles; semilunar valves (in veins) prevent back flow; ventricles contract/ventricular systole occurs; forces blood into aorta/pulmonary artery; atrio-ventricular valves shut preventing back flow into atria; atria and ventricles then relax so heart fills with blood; semilunar valves (in arches) are closed at this stage |
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