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5 Written questions

5 Matching questions

  1. Regulation of HR- Parasympathetic
  2. Chemical Regulation of the Heart
  3. Name 1 important intracellular parameter that can inc. contractility
  4. Contractility
  5. Atrial Brainbridge Reflex
  1. a Calcium
  2. b 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
  3. c Ions influencing heart function
    -calcium
    -patients w/ hypocalcemia (low calcium)
    -depresses HR
  4. d Contractility
    -inc. in contractile strength independent of muscle stretch and EDV
    More vigorous contractions due to...
    -greater Ca++ influx- from extracellular and SR
    Results- more blood ejected from the heart (lower ESV and greater SV)
    Contractility due to inc. sympathetic stimulation
    Norepinephrine and the B1 adrenergic receptors
    -stimulates whole process
    -inc. amt. of Ca+ in cell- how sympathetic NS inc. contractility
  5. e Parasympathetic NS
    -opposed to sympathetic responses
    -reduces HR when stress is relieved
    -Mechanism: Ach receptors(opens K+ channels)
    -Hyperpol. Cardiac cells
    -slows process down

5 Multiple choice questions

  1. 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
  2. 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
  3. 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
  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. Contraction
    - ejection of blood

5 True/False questions

  1. Regulation of HR- At restSV is the difference between
    -EDV- end diastolic volume
    -amt. of blood collects in the ventricle during diastole
    ESV- end systole volume
    -volume of blood remaining in ventricle after contraction
    EDV-ESV= SV

          

  2. Cardiac Cycle- Phase 5- Ventricular SystoleVentricular 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

          

  3. Cardiac PressuresCO=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

          

  4. Preload- Stretch of Cardiac Muscle"Frank- Starling Law" of the heart
    -Factor controlling SV is preload
    -Preload- or degree of stretch before the muscle contracts
    -Why?
    Stretch muscle fiber (and sarcomeres) inc. numbers of active across bridge (actin/myosin)
    All muscle if stretched is going to have a better contraction
    More muscle fibers stretched greater the force of contraction

          

  5. Cardiac Cycle- Phase 3 (Ventricular Systole)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