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PHYS 1525 First Exam Practice Questions 1

PHYS 1525 First Exam Practice Questions 1 - Visceral phys...

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Visceral phys test #1 1. The plateau phase of an action potential from ventricular muscle is due to A. opening of fast potassium channels. B. opening of fast sodium channels. C. opening of slow calcium channels D. closing of slow potassium channels E. closing of slow sodium channels 2. Rapid filling of the ventricles occurs when A. atrial contraction occurs B. atrial pressure exceeds ventricular pressure opening the A-V valves C. end diastolic volume is equal to the stroke volume D. the first heart sound is complete E. the QRS wave is completed 3. If a channel blocking agent were used to block the gap junctions in cardiac muscle, how would this influence the function of the heart? A. calcium ions would still trigger muscle contraction B. the heart would beat faster and with greater vigor C. parasympathetic regulation would take over control of heart function D. the AV node would take over as the pacemaker of the heart E. electrical signals would not be conducted from cell to cell to stimulate coordinated contraction. 4. The SA node serves as the pacemaker of the heart because 5. Cardiac output is calculated by A. heart rate X systolic pressure B. systolic pressure X diastolic pressure C. heart rate X 60 D. stroke volume X heart rate E. end diastolic volume ? end systolic volume 6. During the isovolumetric phase of contraction, the A-V valves are _____ and the aortic and pulmonic valves are________.
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7. Increased sympathetic activity to the heart would 8. The valve that prevents backflow of blood into the left ventricle during ventricular relaxation is the A. S-A valve B. tricuspid valve C. mitral valve D. pulmonary semilunar E. aortic semilunar valve 9. The cardiac tissue that has the fastest conduction velocity for electrical impulse transmission is the
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