Key words - Heart 0.0 / 5 ? Physical EducationAnatomy & physiologyA2/A-levelOCR Created by: grace_netballCreated on: 05-01-19 15:32 myocardium helps heart to generate own impulse 1 of 26 pulmonery circuit top half (lungs) 2 of 26 systematic circuit bottom half (body) 3 of 26 myogenic the ability of the heart to generate its own electrical impulse. This allows the heart to contract. 4 of 26 cardiac diastole relaxation of the cardiac muscle 5 of 26 cardiac systole contaction of the cardiac muscle 6 of 26 heart rate the number of cardiac cycles in one minute 7 of 26 what is the efficiency of the cardiac muscle affected by? fitness, genetics and gender 8 of 26 bradycardia when your resting heart rate is below 60 bpm 9 of 26 stroke volume volume of blood ejected from the left ventricle per beat 10 of 26 venous return volume of blood returning to the heart via the veins 11 of 26 ventricular stretch amount of stretch in cardiac muscle fibres 12 of 26 cardiac output volume of blood ejected from the left ventricle per minute 13 of 26 sub - maximal exercise aerobic (low intensity) 14 of 26 maximal exercise anaerobic (high intensity) 15 of 26 autonomic nervous system (ANS) involuntary regulates heart rate and firing off SA node 16 of 26 cardiac control centre (CCC) recieves information through sensory nerves and sends direction through motor nerves to change HR 17 of 26 chemoreceptors ( neural control) detect chemical changes in the bloodstream 18 of 26 proprioceptors ( neural control) motor activity 19 of 26 baroreceptors ( neural control) increase in blood pressure 20 of 26 intrinsic control temperature changes, venous return changes 21 of 26 hormonal control noradrenaline and adrenaline 22 of 26 sympathetic nervous system (accelerator nerve) increases heart rate and force of contraction 23 of 26 parasympathetic nerve (vagus nerve) decreases heart rate and force of contraction 24 of 26 arteries / arterioles transport high pressure oxygenated blood to organs and working muscles 25 of 26 veins / venules transport low pressure oxygenated blood to the heart 26 of 26
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