Cardiovasclar system 5.0 / 5 based on 2 ratings ? Physical EducationAnatomy & physiologyASAQA Created by: sherbeCreated on: 31-05-17 15:00 Venous Return Mechanisms: Skeletal muscle pump, Respiratory pump, Valves, Muscular contractions, gravity, suction of the heart 1 of 22 Cardiac conduction order SAN,Atrial systole, AVN, Bundle of His, purkinje fibres, ventricular systole 2 of 22 Neural control mechanisms Baroreceptor(pressure),propioreceptor(movement),chemoreceptors(pH) 3 of 22 Adrenaline Stress hormone that is released by sympathetic nerves and cardiac nerves during excersise which causes increase in heart rate 4 of 22 Stroke volume Vol of blood pumped out by the heart by each contraction 5 of 22 Starlings law increased venous return -> Greater diastolic filling -> cardiac muscle stretched -> more force of contraction -> increased ejection fraction 6 of 22 Cardiac output Vol of blood pumped out of the heart per min (stroke vol x heart rate) 7 of 22 Heart Rate No. of times the heart beats per min 8 of 22 Ejection fraction Fraction of blood ejected from a ventricle per heart beat 9 of 22 Hypertrophy Enlargement of organ or tissue from the increase in size of its cells 10 of 22 Athletes heart A larger heart due to lots of cardio training with hypertrophy making the heart larger 11 of 22 Bradycardia Resting Heart rate below 60 bpm (in adults) 12 of 22 Cardiovascular drift Increase in HR to compensate for a decrease in stroke volume 13 of 22 Atherosclerosis Occurs when arteries harden and narrow as they become clogged up by fatty deposits 14 of 22 Atheroma fatty deposit found in the inner lining of the artery 15 of 22 Angina Chest pain that occurs when the blood supply through the coronary arteries to the muscles of the heart is restricted 16 of 22 LDL Low density lipoproteins = bad cholesterol 17 of 22 HDL High density lipoproteins = good colesterol 18 of 22 Normal blood pressure 120/80 19 of 22 Bohr Shift When a increase in blood CO2 and a decrease in pH results in a reduction of the affinity of haemoglobin for oxygen 20 of 22 Vaso dilation/vasoconstriction the widening/narrowing of blood vessels to increase/decrease blood flow and move where the blood is going 21 of 22 Arterio-venous difference The difference beetween the oxygen content of the arterial blood arriving at the muscles and the venous blood leaviing the muscles 22 of 22
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