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WorksheetsMechanical Properties of the Heart
Total questions: 9
Worksheet time: 9mins
Were you able to watch the videos in Canvas?
Yes
Yes, but did not finish
No
Arrange the steps in the excitation-contraction coupling of cardiac muscles:
Action potentials traveling down the T-tubules depolarize the cell membrane.
DHP receptors open to allow Ca2+ influx.
Ca2+ influx triggers opening of ryanodine receptors.
Free Ca2+ binds to tropC exposing the myosin-binding site.
Actin myosin binding occurs.
Which of the following exhibits positive inotropy?
beta 1 receptor activation
beta 1 receptor inhibition
muscarinic receptor activation
What will be the effect of Na+/K+-ATPase inhibitor on the contraction of cardiac muscles?
Arrange the events in cardiac cycle that occurs after atrial systole.
Isovolumetric contraction
Ejection phase
Isovolumetric relaxation
Rapid ventricular filling
Diastasis
Match the heart sounds with their causes.
S3
Closure of AV valves
S2
Closure of SL valves
S1
Rush of blood during rapid ventricular filling
S4
Vibration produced by the atrial muscles when contracting against noncompliant ventricles
Can we give beta blockers on patients with heart failure?
Yes
No
Which best describes cardiac output?
The volume of blood pumped out per ventricular contraction
The volume of blood pumped out per minute
The portion of the end-diastolic volume that is ejected.
The number of beats per minute.
Which pressure-volume loop depicts the effects of changes in inotropy to stroke volume?
