Heart quiz 3

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Author:
surprise
ID:
267748
Filename:
Heart quiz 3
Updated:
2014-05-11 17:06:31
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heart bhcc
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heart
Description:
Heart A&P2, quiz 3
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  1. Name the layers of the heart!
    (Start with outter most layer)
    • Pericardium *itself has 2 layers, w. Cavity in between
    • Myocardium
    • Endocardium
  2. What is the function of the pericardium?
    Anchors the heart in place
  3. Blood flows through the heart via what chambers/parts?
    (Start w. Vena cavas n go until lungs)
    • Superior & inferior vena cava
    • Right atrium
    • Tricuspid valve
    • Right ventricle (PO2 is 40, PCO2 is 45)
    • Pulmonary valve (O2 40, CO2 45)
    • Into
    • Pulmonary artery
  4. Cont. With blood flow direction (start w. Lungs and work back)
    • From lungs it enters back into heart via...
    • Pulmonary veins (PO2 100, CO2 40)
    • Left atrium
    • Bicuspid (mitral)
    • Left ventricle
    • Aortic valve
    • Into body--- circulation
  5. What is the chordae tendineae? Function?
    Strings on the trip and bi cuspid valves.  They prevent them from turning around or flipping
  6. List the coronary arteries!
    • Right coronary artery
    • --R marginal artery
    • --post descending branches

    • Left coronary artery
    • --anterior descending
    • --circumflex
  7. anterior view
  8. posterior view
  9. List 4 main properties/facts of the heart
    • ENTIRELY Aerobic! (can't work without oxygen)
    • Automatic (can depolarize itself)
    • Interconnected (every cell is "holding hands")
    • NO tetanus (no lockup)

    tetanus- maximum contraction from rapid firing
  10. Which node is the fastest in the whole heart?
    sinoatrial (SA) node, aka the pacemaker! It starts the fire!
  11. Which direction does the SA's signal go?
    (towards R or L ventricle or left atrium)

    AND where does it go next?
    SA signal spreads across the top half of heart (atrium).  It won't spread down to ventricles b/c of fibrous skeleton (an electrical insulator).

    Signal then reaches atrioventricular node (AV node)
  12. After AV node, what happens next?
    1/10th of a second delay then spreads down the AV bundle (AKA the Bundle of Hiss)
  13. after bundle of hiss?
    passes to purkinje fibers (located in side walls of ventricles) which pushes up from bottom
  14. What is the only way for signal to travel from atrium to ventricles?
    Bundle of Hiss!!
  15. SO in general how does conduction works?
    • 1. top contracts first
    • 2. bottom pushes up
  16. What is diastole?
    RESTING
  17. What is systole?
    CONTRACTING
  18. what is end diastolic volume?
    120ml in the right ventricle (before it's pushed thu pulmonary valve)
  19. what is stroke volume?
    80ml, it's vol of blood that gets pushed from R ventricle thru pulmonary valve
  20. what is end systolic?
    40ml, it's vol of blood that is left over in R ventricle, doesn't get pumped out
  21. what is ejection fraction?
    The % that gets pushed out
  22. In terms of pressure, how does blood move through the heart?
    Flows from greater to a lesser pressure
  23. S1 is the sound of which valve closing?
    Tricuspid
  24. S2 is the sound of which valve closing?
    Pulmonary

    • The time between sounds is systole (contraction)
    • The time after 2nd sound, but before 1st is diastole (rest)
  25. Cardiac cycle is the same on both sides, EXCEPT which side has higher pressures?
    LEFT side.  VOLUME IS THE SAME
  26. Can all the valves be open at same time?
    NEVER!  but they can be CLOSED at the same time
  27. What is PRELOAD?
    End diastolic volume pressure that stretches the right or left ventricle of the heart to its greatest dimensions
  28. What is AFTERLOAD
    • It is the stress developed in the wall of the left ventricle during ejection.
    • In other words, it is the end load against which the heart contracts to eject blood
  29. What is contractility?
    represents the intrinsic ability of the heart/myocardium (muscle) to contract
  30. What does starling law state?
    You can only pump what heart gets!

    CO=VR

    • CO- cardiac output
    • VR- venous return
  31. What is the "normal" adult cardiac output
    5 liters per min
  32. What controls veinous  return? (VR)
    • how much blood (volume) &
    • how much space to fill

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