第四章单元测试
- Blood pressure can be buffered by___.（ ）
- If stroke volume is 75ml/beat and heart rate is 80 beats /min, what is the cardiac output?（ ）
- In which phase of cardiac cycle is the pressure of the ventricle highest？（ ）
- AV valves close at___.（ ）
- The cardiac output of healthy adult male at rest is（ ）
- The second heart sound is primarily formed by（ ）
- Autoregulation of heart pumping function means that the stroke volume is determined by ____.（ ）
- AV valves open at ___.（ ）
- Which type of the myocardial tissue has the fastest conduction velocity?（ ）
- The excitability of cardiac muscle cell in the supranormal period is higher than normal, so ___.（ ）
A:elasticity of aorta B:venous return C:rate of transfusion D:cardiac contractility E:heart rate
答案:elasticity of aorta
A:5.25 L/min B:5.5 L/min C:2.0 L/min D:6.0 L/min E:3.0 L/min
A:the end of rapid ejection period B:the end of rapid filling period C:the end of ventricular systole period D:the end of atrial systole period E:the end of isovolumetric contraction period
A:the end of isovolumetric relaxation period B:the beginning of isovolumetric contraction period C:the beginning of isovolumetric relaxation period D:the beginning of rapid ejection period E:the beginning of rapid filling period
A:9-10 L/min B:11-12 L/min C:7-8 L/min D:4-6 L/min E:2-3 L/min
A:none of above B:the closure of AV valves C:the open of AV valves D:the open of the semilunar valves E:the closure of the semilunar valves
A:cardiac reserve B:end systolic volume of the ventricle C:mean arterial pressure D:heart rate E:end diastolic volume of the ventricle
A:the end of the slow ejection period B:the end of isovolumetric relaxation period C:the beginning of isovolumetric contraction period D:the beginning of the ventricular systole E:the end of isovolumetric contraction period
A:the Purkinje fiber B:A-V node C:the ventricle D:the atria E:SA node
A:conduction velocity of excitation is also faster than normal B:the autorhythmicity is higher than normal C:the velocity of the phase 0 of an action potential is faster than normal D:the amplitude of the action potential is higher than normal E:the threshold intensity is lower than normal
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