Cardiovascular Physiology Quiz

Intrinsic conduction system = Does not connect to every cardiac myocyte Action potentials in cardiac pacemaker tissues = Unstable RMP (Na leakage channels), Plateau phase (Ca in K out), Slow Ca channels ECG phases = P wave, QRS complex, T wave SA no longer fires = No atrial depolarisation, Bradycardia

P wave = A phase in ECG QRS complex = Another phase in ECG T wave = Final phase in ECG SA node not firing = Results in no atrial depolarisation and Bradycardia

Second pacemaker in atrial tissue from ectopic tissue = Results in multiple P waves Second pacemaker in ventricles from ectopic tissue = Ventricular waves take over, leads to Ventricular tachycardia SA node not firing = No atrial depolarisation and Bradycardia Unstable RMP in cardiac pacemaker tissues = Due to Na leakage channels

<p>Passive ventricular filling = AV valves open, Semilunar valves closed Atrial contraction = AV valves open, Semilunar valves closed Isovolumetric ventricular contraction = AV valves closed, Semilunar valves closed Ventricular ejection = AV valves closed, Semilunar valves open</p> Signup and view all the answers

<p>End diastolic volume increases = Stroke volume increases End systolic volume increases = Stroke volume decreases Preload increases = Stroke volume increases Afterload increases = Stroke volume decreases</p> Signup and view all the answers

<p>Stroke volume decreases, TPR increases = Overall blood pressure increases Pulse pressure decreases = Overall blood pressure decreases Diastolic pressure rises = Overall blood pressure increases Mean arterial pressure rises = Overall blood pressure increases</p> Signup and view all the answers

<p>Pulmonary vein pressure = Lower than atria Atria pressure = Lower than ventricle Ventricular pressure = Rising, higher than atria, lower than aorta Aorta pressure = High but decreasing</p> Signup and view all the answers

<p>Increased output from cardio inhibitory centre – decrease heart rate = Receptors on the aortic arch detect a marked increase in blood pressure Decreased output from cardio inhibitory centre – increase HR = Receptors on the carotid bodies detect a marked decrease in blood pressure Increase cardiac output = Body's response to increase overall blood flow into all arteries when mean aortic pressure is 100mmHg Vasoconstriction in renal arteries/arterioles = Body's response to decrease blood flow to the kidneys when mean aortic pressure is 100mmHg</p> Signup and view all the answers

<p>Flow is into all arteries, but highest into hepatic artery, followed by renal artery and subclavian = Mean aortic pressure is 100mmHg, mean renal artery pressure is 80mmHg, mean hepatic artery pressure is 70mmHg, mean subclavian artery pressure is 90mm Hg Highest into subclavian, no flow into hepatic = Mean aortic pressure is 90mmHg, mean renal artery pressure is 80mmHg, mean hepatic artery pressure is 90mmHg, mean subclavian artery pressure is 60mm Hg Vasodilation in hepatic arteries/arterioles = Body's response to increase blood flow to the liver when mean aortic pressure is 100mmHg</p> Signup and view all the answers

<p>Vasoconstriction = Decrease output from vasomotor centre Vasodilation = Increase output from vasomotor centre Increased HR = Decreased output from cardio inhibitory centre Decreased HR = Increased output from cardio inhibitory centre</p> Signup and view all the answers

<p>Receptors on the aortic arch</p> Signup and view all the answers

<p>Decrease heart rate</p> Signup and view all the answers

<p>Vasodilation</p> Signup and view all the answers

<p>The pressure is lower than the atria</p> Signup and view all the answers

<p>Increases</p> Signup and view all the answers

<p>Cardiac muscle fibers are innervated by the intrinsic conduction system</p> Signup and view all the answers

<p>Cardiac pacemaker tissues have sodium leakage channels, while cardiac muscle has potassium leakage channels</p> Signup and view all the answers

<p>Atrial depolarization</p> Signup and view all the answers