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- In the nineteenth century, Poiseuille’s law was experimentally deduced byJ. L. M. Poiseuille, who was interested in understanding the flow of blood inhorses’ arteries.We nowknowthat Poiseuille’s lawis a poorway of modelingblood flow in arteries. In your own words, give at least three reasons whyPoiseuille’s lawis not appropriate for arterial blood flowmodeling, and brieflydiscuss why this is the case.If you were to look at an ECG trace of a 65-year-old male who hasrecently being diagnosed with a form of myocardia infraction indicated by aleft axis deviation. What do you expect to see significantly different on Lead Iand aVF of this individual? How does this abnormal ECG tracing results inthe diagnosis of left axis deviation?Cardiac pacemaker cells fıre an action potential similar to neurons. The influx of what ion is responsible for the prolonged depolarization after threshold has been reached in a cardiac muscle fiber? O C- O K+ O Mg+ O Ca 2+
- Fibrillation is abnormal, rapid contractions of different parts of the heartthat prevent the heart muscle from contracting as a single unit. Explainwhy atrial fibrillation does not immediately cause death but ventricularfibrillation does.In cardiac autorhythmic pacemaker cells, how does parasympathetic stimulation make it more difficultfor an action potential to occur?Which of the following is TRUE of the cardiac action potential? O The cardiac action potential requires external stimulation The cardiac action potential does not have repolarization The cardiac action potential is longer than the skeletal muscle action potential The cardiac action potential has no refractory period O The cardiac action potential has a shorter refractory period than skeletal muscle
- Which ONE of the following statements is TRUE? OA Cardiac myocyte contraction results primarily from an increased concentration of intracellular Na OB Prazosin is an agonist at a2 adrenergic receptors OC Veins can accommodate large volumes of blood but this causes a large increase in pressure OD The pulse pressure is the addition of systolic and diastolic pressure OE The primary integrating centre for baroreceptor reflexes is the medullary cardiovascular centreFor what are If channels responsible in cardiac autorhythmic cells? O Action potential O The pacemaker potential O Cardiac diastole Membrane repolarizationThe entry of calcium into a ventricular muscle cell helps to maintain depolarization of the membrane during the plateau phase of the action potential, but this calcium also performs what other function?
- isovolumetric contraction isovolumetric relaxation ventricular filling ventricular ejection closed rises S1 drops depolarize S2 The first phase of the cardiac cycle is . This is when a lot of blood is in the atria, which causes atrial pressure to be higher than the ventricles. The atrioventricular valves open, and blood moves from the atria to the ventricles. At the end of this phase, the atria contract to maintain pressure and blood flow into the ventricles. As blood leaves the atria, the pressure in the atria As blood enters the ventricles, the pressure in the ventricles Towards the end of this phase, the pressure in the ventricles will exceed the pressure in the atria. At this point, the heart enters the second phase of the cardiac cycle: At this point, the AV valves shut, and we hear . The atria repolarize and the ventricles (due to the QRS complex of the ECG), causing ventricular contraction. Although contracting, it is not yet moving blood into the arteries. All 4 heart valves…What would be the fastest possible HR if the absolute refractory period for the cardiac myocyteswas 250 ms?What is the effect of high blood pressure on cardiac output? > View Available Hint(s) High blood pressure reduces afterload, thereby increasing cardiac output (CO). O High blood pressure increases afterload and reduces cardiac output (CO). High blood pressure increases preload and ventricular filling, thereby increasing cardiac output (CO). High blood pressure occurs only when the cardiac output is already very high. ower