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5 Written questions

5 Matching questions

  1. Cardiac Cycle- Pressure and Volume changes
  2. Cardiac Cycle- Phase 4 (Isovolumetric Relaxation)
  3. True or False: semilunar valves and atrioventricular valves are closed during isovolumetric contraction phase?
  4. Afterload- Back pressure
  5. Cardiac Cycle- Phase 5- Ventricular Systole
  1. a During Ventricular Systole
    1. Atria is in diastole and fills
    2. Intra-atrial pressure inc. b/c atria filling
    3. Pressure in atria forces AV valves open- ventricular filling begins
    4. Atrial pressure drops and vent. pressure rises completing the cycle
  2. b Back pressure of aortic and pulmonary valve must be over come by ventricle to open valves and eject blood
    -80 mm Hg (aorta)
    -8 mm Hg (pulmonary)
  3. c Pressure and Blood volume changes
    -left side of heart- 5x greater pressure than right side
    -regardless both ventricles pump the same volume of blood per beat
  4. d True
  5. e Isovolumentric Relaxation(early diastole)
    -Following the T wave(repol. of vent.) ventricles relax- not compressed
    -"end systole volume" (ESV)
    -blood that did not get pumped out- remaining in vent.
    -blood in aorta and pulmonary trunk back flows closing semilunar valves
    -so blood can't go back into heart
    -closed semilunar valves cause a short rise in aortic pressure as blood rebounds off closed valve
    -creates the dicrotic notch
    -Isovolumetric relaxation- ventricles again totally closed off

5 Multiple choice questions

  1. Sympathetic reflex caused by...
    -inc. in venous return
    -blood congestion in the atria
    Stretching of the atrial walls inc. HR and force by...
    -directly stimulating the SA node
    -stimulating by baroreceptors in the atria (pressure receptors)
    -triggers adjustment- inc. symptoms/stimulation of the heart
  2. Calcium
  3. Length of cycle- .8sec
    -average 75 beats/min
    -atrial systole .1 sec
    -ventricular systole- .3 sec
    -remaining .4 total- heart relaxation termed "quiescent period"
  4. Ventricular Systole
    -atria relaxed- ventricles start contraction phase
    -ventricular pressure rises rapidly
    -Back pressure closes the AV valves
    -"isovolumetric Contraction Phase"
    -briefly ventricle closed off chambers and blood vol. is constant
    -Ventricular pressure exceeds pressure in arteries
    -semilunar valves are forced open
    -ends isovolumetric contraction phase
    -ventricular ejection phase
    -blood leaves ventricle and enters aorta and pulmonary trunk
    - aortic pressure reaches 120 mmHG
    -In left side of heart
  5. Blood flow through the heart is controlled by pressure
    Blood flows along a pressure gradient
    -always high to low pressure
    Keeps blood flowing in only 1 direction

5 True/False questions

  1. EDV and ESV parametersHeart Murmurs- leaky valve
    -blood generally flows silently
    W/ heart valve promblems
    -blood creates a "swishing" sound as it leaks backward or regurgitates through incompletely closed valves

          

  2. Regulation of Heart Rate- Autonomic NSAutonomic NS Regulation (extrinsic factor regulating the heart)
    Under stress, fright, anxiety, excitement
    -sympathetic fibers release norepinephrine
    -binds to B1- andrenergic receptors
    -causes threshold to be reached quicker- pacemaker fires more rapidly faster beat

          

  3. Regulation of HR- At restBoth divisions of the autonomic NS send impulses to the heart
    The dominant influence is inhibitory termed 'Vagal Tone'
    -cutting the 'vagal nerve' (parasympathetic input removed) causes a quick inc. in beats/min

          

  4. Chemical Regulation of the HeartBoth divisions of the autonomic NS send impulses to the heart
    The dominant influence is inhibitory termed 'Vagal Tone'
    -cutting the 'vagal nerve' (parasympathetic input removed) causes a quick inc. in beats/min

          

  5. Complete Cardiac CycleCO=HR x SV
    Cardiac Output (CO)- amt. of blood pumped by each ventricle in 1 minute
    -HR- heart rate
    -SV (stroke vol)- vol. of blood pumped by vent. per heart beat
    -correleated w/ force of ventricular contraction

          

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