7) during the cardiac cycle, which of the following occurs when left venticular

Question

7) during the cardiac cycle, which of the following occurs when left venticular pressure rises above aortic pressure: a) the aortic valve closes, b) aortic valve opens, c) mitral valve closes, d) mitral valve opens, e) pulmonary valve closes

8) what lead primarily measures forces moving from head to feet: a) v6, b) lead I, c) avr, d) v1, e) avf

9) if two successive QRS complexes are 0.6 seconds apart: a) heart rate is 90bmp, b) heart rate is 70 bpm, c) heart rate is 100bpm, d) heart rate is 60 bpm, e) heart rate is 80 bpm

10) if a depolarizing electrial stimulus was applied to a ventricular myocyte, which of the following would be most likely to occur if extracellular calcium was low (below normal): a)the magnitude of phase 0 of the action potential would increase, b) the duration of the plateu phase (phase 2) of the action potential would decrease, c) repolarization of the membrane would not occur i.e. resting membrane potential would not be re-established, d) phase 0 of the action potential would be eliminated, e) the duration of the plateau phase (phase 2) of the action potential would increase

Explanation / Answer

7. A (av closes)

8. E (avf)

9. C (heart rate is 100bpm)

10. B ( the duration of plateu phase (phase 2) of the action potential would decrease )

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