Cardio.5- CVS Bio Control System

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  1. The volume of blood in the ventricle just before it contracts.
    end diastolic volume/ pre-load
  2. What is the set point for cardiac output? (mL/kg/min)
    120 mL/kg/min
  3. What is the set point for stroke volume? (mL/kg)
    1.25 mL/kg
  4. What is the set point for partial pressure caused by the aortic volume? (mmHg)
    100 mmHg
  5. What is the set point for blood volume? (% of body weight)
    7% of BW
  6. What is the set point for [H+] in blood?
    10^7 (pH of 7.4)
  7. What is the set point for [O2] in blood? (mmHg)
    35 mmHg
  8. What is the set point for [OH-] in blood?
    0- shouldn't be any free hydroxyl in blood
  9. What mechanisms keep the controlled variables of the CVS in check? (3)
    level detectors- JGA, high pressure baroreceptors, low pressure stretch receptors
  10. What level detector is in charge of detecting cardiac output and why?
    JGA b/c the kidney received more blood than any other organ
  11. Stroke volume is the difference between...
    end diastolic volume minus end systolic volume.
  12. Mechanoreceptors are located in __________ and are responsible for...
    the ventricles (of the heart); determining how much the ventricle moved when it contracted.
  13. Where are high pressure baroreceptors located within the body?
    aortic sinus, carotid sinus
  14. What are high pressure baroreceptors responsible for?
    determine tension in the wall of an artery (blood pressure)
  15. Where are low pressure stretch receptors located within the body?
    left and right atria, large veins
  16. What is the purpose of an integrator or "summer" in the CV control system?
    structure in the medulla oblongata that knows the set points and receives information from the level detectors; if body levels don't match up to set points, sends an error signal to controllers (heart, vessels, kidneys, thirst) to return controlled variables to normal set points
  17. What are the controlled variables? (5)
    cardiac output and fractionation, stroke volume, aortic volume (pressure), blood volume, blood concs of H+/O2/OH-
  18. What are the "controllers" that adjust the controlled variables? (4)
    heart, vessels, kidneys, thirst
  19. An error signal generated in the integrator in the medulla oblongata can be... (2)
    nervous signal or hormone.
  20. The degree of correction of controlled variables is expressed in terms of ________.
    gain
  21. How do you calculate gain?
    correction divided by what is yet to be corrected.
  22. What is the ideal gain? Why?
    infinity; b/c if yet to be correct is 0, gain will be infinity
  23. What is tau?
    time constant- time it takes to achieve ~60% of the correction
  24. What is the equation for systemic arterial pressure (SAP)?
    SAP = CO x svr

    CO= cardiac output, svr= systemic vascular resistance

    svr= εAO

    CO= SV x HR

    SV= EDV (end diastolic volume)- ESV (end systolic volume)

    EDV= EDP (end diastolic pressure)- PPL (pressure in thorax)÷ εLV

    ESV= εLV (svr) ÷ vmax
Author:
Mawad
ID:
314122
Card Set:
Cardio.5- CVS Bio Control System
Updated:
2016-01-25 14:51:51
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vetmed cardio
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vetmed cardio.5
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