7.5- The cardiac cycle 0.0 / 5 ? BiologyMass transportASAQA Created by: Megan2413Created on: 13-03-17 18:33 What is systole? The contraction of the heart 1 of 25 What is diastole? The relaxation of the heart 2 of 25 What are the three main stages of the cardiac cycle? - Diastole - Atrial systole - Ventricular systole 3 of 25 Which valves control blood flow from the verntricles to the pulmonary arteries and aorta? Semi-lunar valves 4 of 25 What happens during diastole? Atria are relaxed and fill with blood from pulmonary vein and vena cava 5 of 25 What happens to the pressure inside the atria during diastole? It increases as the blood is filling them up 6 of 25 Once the pressure inside the atria exceed that of the ventricles what happens? The atrioventricular valves open allowing blood to pass into the ventricles 7 of 25 What happens during atrial systole? Atria contract, ventricles relax and this forces the remaining blood into the ventricles 8 of 25 What happens after the ventricles fill with blood? They contract simultaneously 9 of 25 What effect does the increase in blood pressure have in the ventricles? It forces the atrioventricular vales shut preventing the backflow of blood from the ventricles back into the atria 10 of 25 What causes the heart beat sound? The shutting of the atrioventricular valves 11 of 25 What happens to the pressure inside the ventricles due to the atrioventricular valves closing? It increases more 12 of 25 What does this cause? Once the pressure exceeds that in the pulmonary artery and aorta, blood is forced from the ventricles into them via the semi-lunar valves 13 of 25 What shape are valves? Cuspid shape 14 of 25 What two sides are there to a valve? Convex and concave 15 of 25 When blood pushes againt the concave side do the valves open or close? Close 16 of 25 When blood pushes against the convex side do the valves open or close? Open 17 of 25 What three main valves are there in the cardiac cycle? - Atrioventricular valves - Semi-lunar valves - Pocket valves 18 of 25 Where are the atrioventricular valves found? In between the atria and the ventricles 19 of 25 Where are the semi-lunar valves found? In the pulmonary artery and aorta 20 of 25 Where are pocket valves found? Inside the veins throughout the venous system 21 of 25 What is cardiac output? The volume of blood pumped from one ventricle in one minute 22 of 25 What is the equation for cardiac output? Cardiac output = heart rate x stroke volume 23 of 25 What are the units for cardiac output? dm3 min-1 24 of 25 What is stroke volume? The volume of blood pumped out at each beat 25 of 25
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