AN SC 310 - 15

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Author:
ebacker
ID:
189064
Filename:
AN SC 310 - 15
Updated:
2012-12-12 14:52:08
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AN SC 310
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Description:
Lecture 15 - The Cardiovascular System: Cardiac Cycle
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  1. What are the 2 periods of cardiac cycle?
    • Systole (contraction)
    • Diastole (relaxation)
  2. What are the 4 phases of cardiac cycle?
    • Ventricle filling
    • Isovolumetric ventricular contraction
    • Ventricle ejection
    • Isovolumetric Ventricular Relaxation
  3. What is stroke volume (definition and number)?
    • Volume of blood ejected by the ventricle each beat
    • 70 mL
  4. What is ejection fraction?
    • fraction of end-diastolic vol ejected during a heartbeat
    • 54%
  5. What is cardiac output?
    • Vol of blood pumped by each ventricle per min
    • Average CO = 5 L/min at rest
  6. What controls the SA node?
    • ANS
    • Hormones
  7. What are the primary factors affecting stroke volume?
    • Ventricular contractibility
    • End-diastolic volume
    • Afterload
  8. What factors influence stroke volume?
    • Venous return => end-diastolic volume
    • Sympathetic Activity/epinephrine => contractibility
    • Arterial pressure (afterload)

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