The HEART 0.0 / 5 ? BiologyBiological moleculesASEdexcel Created by: francesca_321Created on: 03-03-15 17:39 What happens in Atrial systole? The Atria contract, atrial pressure rises and blood is pushed from the atria to the ventricles 1 of 14 What happens in Ventricular systole when the ventricles contract? Ventricular pressure rises above atrial pressure and the atrioventricular valves shut 2 of 14 What happens after the ventricles contract? Ventricular pressure rises but no blood leaves the heart 3 of 14 What happens when the ventricular pressure rises? When they rise above pressure in the arteries the semi lunar valves open 4 of 14 What happens in diastole 1? The ventricles relac 5 of 14 What happens after the ventricular pressure falls in the arteries? The semi lunar valves shut 6 of 14 What happens in Diastole II? The entire heart is relaxed 7 of 14 What valves open? the atrioventricular valves 8 of 14 What happens to the atria and ventricles? They fill with blood 9 of 14 What do the thick muscle layer do? They withstand high pressure blood. 10 of 14 What does the elastic tissue allow? The artery to strech when blood is forced into it 11 of 14 What three structure points are left? collagen layer, round shape and small lumen 12 of 14 What do the veins have that the arteries haven't got? Valves and a large lumen 13 of 14 What else do veins have? A thin muscle layer 14 of 14
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