The cardiac cycle GCSE biology revision of The cardiac cycle 2.0 / 5 based on 1 rating ? BiologyGCSEOCR Created by: harryCreated on: 01-04-13 12:34 How is blood prevented from flowing in the wrong direction? By the atrio-ventricular and semilunar valves 1 of 5 Describe the first stage of the cardiac cycle Blood flows into the two atria (through the vena cava and pulmonary vein) 2 of 5 Describe the second stage of the cardiac cycle The atria contract pushing the blood into the ventricles 3 of 5 Describe the third stage of the cardiac cycle The ventricles contract pushing the blood into the aorta and pulmonary artery 4 of 5 Describe the forth stage of the cardiac cycle The blood flows along the arteries, the atria fill up again and the cycle repeats 5 of 5
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