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5 Written questions

5 Matching questions

  1. Chemical Regulation of the Heart
  2. Why is presure 5x greater on the left side of the heart
  3. Cardiac Pressures
  4. Heart sounds at thorax
  5. Cardiac Cycle- Phase 2 (Ventricular Filling)
  1. a Higher pressure is required to move through entire body. Right side pumps only to the lungs
  2. b Ions influencing heart function
    -calcium
    -patients w/ hypocalcemia (low calcium)
    -depresses HR
  3. c 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. d Lub-dub lub-dub lub-dub
    -heart valves closing
    Pause- represents quiescent period
    First sound-
    -start of systole- vent. pressure rises above atrial pressure
    -louder and longer than the second sound
    Second sound-
    -short, sharp sound of the semilunar valves snap shut
    -at the start of ventricular diastole
    -Note: aortic valve closes before pulmonary valve- can distinguish these by sound
  5. e 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

5 Multiple choice questions

  1. CO=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
  2. Atrial- systole and diastole
    ventricular- systole and diastole
  3. Atrial Systole- depolarization atria contracts
    -compesses blood in the chambers
    -Atrial pressure forces remaining blood into ventricles
    -ventricles last of resting phase(diastole) w/ max blood volume termed "end diastolic volume" (EDV)
    -Atria relax and ventricles depolarize creates-QRS complex
    -Atrial diastole remains through the cycle
  4. 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. Relaxation
    -filling the heart

5 True/False questions

  1. SystoleRelaxation
    -filling the heart

          

  2. Heart MurmursRelaxation
    -filling the heart

          

  3. Name 1 important intracellular parameter that can inc. contractilitySkeletal muscle at rest is near its optimal length for max. tension
    Cardiac muscle at rest is shorter...
    -therefore inc. stretch inc. contractile force
    Anything inc. vol. or speed of venous return- inc. SV
    -HR, exercise, etc.

          

  4. Regulation of HR- ParasympatheticParasympathetic NS
    -opposed to sympathetic responses
    -reduces HR when stress is relieved
    -Mechanism: Ach receptors(opens K+ channels)
    -Hyperpol. Cardiac cells
    -slows process down

          

  5. Cardiac Cycle- Phase 5- Ventricular SystoleDuring 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

          

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