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5 Written questions

5 Matching questions

  1. Stretch and Contraction
  2. Atrial Brainbridge Reflex
  3. True or False: semilunar valves and atrioventricular valves are closed during isovolumetric contraction phase?
  4. Chemical Regulation of the Heart
  5. Complete Cardiac Cycle
  1. a True
  2. b Skeletal 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.
  3. c 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
  4. d Atrial- systole and diastole
    ventricular- systole and diastole
  5. e Ions influencing heart function
    -patients w/ hypocalcemia (low calcium)
    -depresses HR

5 Multiple choice questions

  1. Contraction
    - ejection of blood
  2. 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. 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
  4. Relaxation
    -filling the heart
  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. Heart sounds at thoraxLub-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


  2. Cardiac Cycle- DurationRight 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


  3. Cardiac Cycle- Phase 1(Atrial Systole)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. 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. Regulation of Heart Rate- Autonomic NSParasympathetic NS
    -opposed to sympathetic responses
    -reduces HR when stress is relieved
    -Mechanism: Ach receptors(opens K+ channels)
    -Hyperpol. Cardiac cells
    -slows process down