Physiology章节测试课后答案2024春

第四章测试

1.Blood pressure can be buffered by___.（ ）
A:heart rate B:elasticity of aorta C:rate of transfusion D:cardiac contractility E:venous return
答案:B
2.If stroke volume is 75ml/beat and heart rate is 80 beats /min, what is the cardiac output?（ ）
A:6.0 L/min B:3.0 L/min C:2.0 L/min D:5.25 L/min E:5.5 L/min 3.In which phase of cardiac cycle is the pressure of the ventricle highest？（ ）
A:the end of isovolumetric contraction period B:the end of atrial systole period C:the end of ventricular systole period D:the end of rapid filling period E:the end of rapid ejection period 4.AV valves close at___.（ ）
A:the end of isovolumetric relaxation period B:the beginning of rapid filling period C:the beginning of rapid ejection period D:the beginning of isovolumetric contraction period E:the beginning of isovolumetric relaxation period 5.The cardiac output of healthy adult male at rest is（ ）
A:11-12 L/min B:2-3 L/min C:4-6 L/min D:9-10 L/min E:7-8 L/min 6.The second heart sound is primarily formed by（ ）
A:the closure of AV valves B:none of above C:the open of AV valves D:the open of the semilunar valves E:the closure of the semilunar valves 7.Autoregulation of heart pumping function means that the stroke volume is determined by ____.（ ）
A:end diastolic volume of the ventricle B:end systolic volume of the ventricle C:heart rate D:cardiac reserve E:mean arterial pressure 8.AV valves open at ___.（ ）
A:the end of the slow ejection period B:the beginning of the ventricular systole C:the end of isovolumetric contraction period D:the beginning of isovolumetric contraction period E:the end of isovolumetric relaxation period 9.Which type of the myocardial tissue has the fastest conduction velocity?（ ）
A:the atria B:A-V node C:the Purkinje fiber D:the ventricle E:SA node 10.The excitability of cardiac muscle cell in the supranormal period is higher than normal, so ___.（ ）
A:conduction velocity of excitation is also faster than normal B:the amplitude of the action potential is higher than normal C:the threshold intensity is lower than normal D:the velocity of the phase 0 of an action potential is faster than normal E:the autorhythmicity is higher than normal