Exam 1 A&p 352 study guide.docx - 1 2 3 4 5 6 7 8 9 10...

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1. Ap enters from other cell 2. Voltage gated Ca+2 channels open and enters cell 3. Ca+2 induces Ca+2 release through RyR 4. Ca+2 spark 5. Ca+2 signal 6. Ca+2 binds to troponin, contraction 7. Relaxation, Ca+2 unbinds from troponin 8. Ca+2 pumped into SR 9. Ca+2 exchanged for Na+ 10. Na+-K+-ATPase myocyte 1. -90 mv 2. Na+ influx 20mv, depolarization 3. Na+ channels close, K+ channels efflux open slow, small repolarization 4. Ca+ influx And K+ efflux equal; plateau 5. Ca+ channels close, Efflux of K+ restore resting potential, repolar Pacemaker 1. -60 mv 2. Na+ influx and K+ efflux, slow depolar. -40mv 3. Ca+2 channels open influx fast, depol. 4. Ca+2 channels close, K+ efflux, repolar. Tetanus- sustained contraction Isovolumetric contraction- both AV and SL valves closed, ventricles contract before SL valve opens Isovolumetric relaxation- AV and SL closed, after ventricles push through SL. Relax while atria fill Max Blood Volume- End diastole vol. Min- End systole vol Ventricles EDV-EDS= Stroke volume (mL/beat) Cardiac Outpu= HR* Stroke Volume Beats/min *mL/beat= L/min
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