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5 Written questions

5 Matching questions

  1. Regulation of Heart Rate- Autonomic NS
  2. Chemical Regulation of the Heart
  3. EDV and ESV parameters
  4. Cardiac Cycle- Duration
  5. Cardiac Pressures
  1. a Right side of heart- pulmonary side
    -systole- 24 mm Hg
    -diastole- 8 mm Hg
    Left side of heart- aortic side
    -systole- 120 mm Hg
    -diastole- 80 mm Hg
  2. b EDV- two parameters (120 ml)
    1. length of ventricle diastole- how long is vent. relaxing?
    2. Venous pressure- how much pressure is there to bring blood into ventricle?
    ESV- two parameters(50 ml)
    1. atrial BP
    2. force of vent. contraction
  3. c Ions influencing heart function
    -patients w/ hypocalcemia (low calcium)
    -depresses HR
  4. d Autonomic 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
  5. e Length of cycle- .8sec
    -average 75 beats/min
    -atrial systole .1 sec
    -ventricular systole- .3 sec
    -remaining .4 total- heart relaxation termed "quiescent period"

5 Multiple choice questions

  1. CO (ml/min)= HR (75 beats/min) x SV (70 ml/beat)
    Normal blood volume- 5 Liters
    Entire blood volume through heart every minute
    Co is highly variable
    -altered by SV or HR or both
    Cardiac Reserve
    -maximal CO- Resting CO
    -Cardiac reserve (normally) 4-5 times greater than resting CO
    -Athletes about 7x greater than resting CO
  2. True
  3. Ventricular filling (mid-to-late diastole)
    -returning blood flowing into atria and opens AV valve to ventricles
    -semilunar valves closed (aortic and pulmonary)
    -70% of ventricular filling
    -AV valve begins to close- blood trapped in ventricle
    -Preparing for atrial systole
  4. Heart 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
  5. 1. Preload- amt. vent. stretched by blood (affects EDV)
    2. Contractility- cardiac cell contractile force
    -Effects ESV- more cont.- less blood remains
    3. Afterload- back pressure exerted by blood in the large arteries leaving the heart
    -Effects ESV

5 True/False questions

  1. Atrial Brainbridge ReflexRight side of heart- pulmonary side
    -systole- 24 mm Hg
    -diastole- 8 mm Hg
    Left side of heart- aortic side
    -systole- 120 mm Hg
    -diastole- 80 mm Hg


  2. DiastoleContraction
    - ejection of blood


  3. Cardiac Cycle Important PointsBlood 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


  4. 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


  5. 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