7.3 Peak preformance 0.0 / 5 ? BiologyHealth, illness and diseaseA2/A-levelEdexcel Created by: Sophie kendallCreated on: 12-01-14 13:49 What is aerobic capacity The ability to take in, transport and use oxygen. 1 of 19 What is VO2 our intake of oxygen per minute, VO2 max is what it is during exercise. 2 of 19 What will the body change uncontiously during exercise ventilation and cardio-vascular system. 3 of 19 formula for cardiac output stroke volume x heart rate 4 of 19 what is stroke volume measured in? cm3 5 of 19 What is venous return The amount of blood returning to the heart after a contraction. 6 of 19 What happens to cardiac output during exercise and why? it increases because more blood is taken in during exercise and therefore the recoil is greater 7 of 19 At rest what % does the heart empty to? 40% 8 of 19 Give 2 reasons that heart rate can vary 1. heart size, 2.endurance training 9 of 19 the heart will contract without any nervous stimulation, what do you call this? myogenic 10 of 19 Describe how the charge is caried through the heart small changes cause the cells to become polarised which effects the cells surrounding and spreads like a wave. 11 of 19 Where does depolarisation start? the sinoatrial node 12 of 19 What physical path does the impulse take round the heart? 1. across the atria walls, 2.to the ventricles via the AVN, 3. down to the apex of the heart 4. up the sides causing ventricle contraction 13 of 19 there is a 0.13s delay between the atria and ventricle contacting why? to allow the ventricles to fill with blood 14 of 19 what is it that we here when we listen to the heart beat? the valves closing 15 of 19 what is the bundle of his and what is it made of? a group of fibres called the purkyne fibres 16 of 19 how can the electrical activity be displayed? an electrocardiogram (ECG) 17 of 19 How is an ECG carried out? Electrodes are stuck on the person, the electrodes can detects when there is a change in polerisation. 18 of 19 What 4 parts does the ECG contain P wave, PR interval, QRS complex, T wave. 19 of 19
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