Phys2 Cardiac cycle
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| show | 1.Isovolumetric contraction.
2.Rapid Ejection.
3.Reduced Ejection.
**All of this is occuring during Phase 2 of the ventricular AP.
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| show | 1.Isovolumetric relaxation.
2.Rapid ventricular filling.
3.Reduced ventricular filling.
4.Atrial Systole (Pwave).
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| What determines whether or not a heart valve is open or closed? | show 🗑
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| What are the 5 main stages of the cardiac cycle? | show 🗑
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| what wave represents Atrial systole (phase 1b of cardiac cycle)? how long does it take? does it contribute to the LV volume? | show 🗑
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| show | NO VALVE CHANGE!! the MAP is falling down closer to 80mmHg.
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| show | 1.Valves: Mitral valve closes (initiates).
2.Pressure:rises from 15 to 80mmHg.
3.Volume:No change (EDV, flatline MAX on graph).
4.Sounds:S1 (mitral valve closing).
5.Atrial wave:C wave (mitral valve push into atria).
6.Time:0.05sec.
7.ECG:end of QRS
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| Rapid & Reduced Ejection (phase 3 of cardiac cycle) | show 🗑
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| is PEAK systolic pressure at the end or the middle of the ejection phase (3)? | show 🗑
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| When is the majority of the BL volume pumped out of the LV? | show 🗑
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| show | 1.Valves:Aortic semilunar closes (mitral valve remains closed).
2.Pressure:Drops from 100 to 0mmHg.
3.Volume:No change (ESV, flatline MINIMUM).
4.Sounds:S2 (aortic closes).
5.Atrial wave:none.
6.Time:0.08s.
7.ECG:T wave
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| When does Isovolumetric relaxation (phase 4) and passive ventricular filling (phase 1a) begin? | show 🗑
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| What does the Dicrotic notch represent? how does MAP remain above 80mmHg? | show 🗑
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| Passive ventricular filling (phase 1a of cardiac cycle) | show 🗑
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| How are the pressure changes in the R heart compared to the L heart? | show 🗑
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| show | NO.
Low HR (60bpm): Diastole is 2X longer.
High HR (180bpm): Diastole is 1/2 systole (which will decrease EDV)
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| Average time spent in ventricular systole? (phases 2&3) | show 🗑
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| Average time spent in ventricular diastole? (phases 1a&1b&4) | show 🗑
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