HUMAN PHYSIOLOGY TEST 3

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Anonymous
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182157
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HUMAN PHYSIOLOGY TEST 3
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2012-11-08 21:31:02
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  1. What is the equation for Blood Flow?
    Blood Flow=Change In Pressure/Resistance (around 90)
  2. Factors that determine resistance to blood flow?
    • Blood Vessel Diameter
    • Viscosity of Blood
    • Blood Vessel Length
  3. What is Poiseulles Law?
    R=8nL/R^4
  4. What is a pace maker potential?
    Spontaneous Depolarization due to SA node.
  5. During a pacemaker potential what gates open and close?
    • K Channels close
    • Funny Channels open
  6. What are the two types of Calcium channels, and when are they utilized?
    I & F type. Utilized in Rapid Depolarization.
  7. Descripe AP process in a contractile cell
    • Increase Permeability to NA
    • Decrease Permeability to Na (Depol)
    • Increase Permeability to Calcium (Plateau)
    • Repolarization via open Potassium Channels.
    • Resting membrane potential is -90

    Starts via Na & Ca passing through GAP JUNCTIONS!
  8. What are gap junctions?
    Connective channels between cardiac muscle.
  9. ECG Question:
    What is the P Wave?
    Atrial Depolarization
  10. ECG Question:
    What is the QRS complex?
    Ventricles Depolarizaing
  11. ECG Question:
    What is the T Wave?
    Ventricular Repolarization
  12. ECG Question:
    What is the PQ segment?
    Time between initiation of atrial depol n venticular depol
  13. ECG Question:
    What is the Q-T segment?
    Time between Ventricular depolarization and ventricular repolarization. (Ventricular contraction and systole)
  14. ECG Question:
    What is the R-R segment?
    Heart Rate
  15. What is Tachycardia?
    Increased Heart Rate
  16. What is Bradycardia
    decreased heart rate
  17. Describe the degrees of heart block
    • 1.Increase in P-Q segment. (Delay between SA to AV)
    • 2. Greater increase. Loss of 1:1 P to QRS
    • 3. Loss of AV conduction. P & QRS are independent.
  18. What is systole?
    Ventricular contraction
  19. What is diastole?
    Ventricular Relaxation
  20. What is the pericardium?
    Membranous Sac around heart. Decreases friction
  21. What are the layers of the heart wall?
    • Endo, Myo, Epicardium
    • Inner----------->Outer
  22. Properties of cardiac muscle
    • Cells are smaller than cells of skeletal muscle.
    • Cells demonstrate branching¬†
    • Striations are EVIDENT!
    • No cell division after infancy
    • 99% contractile cells
  23. Path of conduction in heart
    SA node- AV node- AV Bundle (Bundle of His) - Bundle Branches- Purkinje fibers
  24. What is the fastest AP firing cells in the heart?
    SA Node (Pacemaker) Sets rate of rest for the rest.
  25. What is Stoke Volume?
    EDV-ESV
  26. What is the equation for Cardiac Output?
    CO= SV x HR
  27. What is the equation for mean arterial pressure?
    MAP=CO x TPR
  28. What are some short term regulations of MAP?
    Heart & Neural Contral (Sympathetic & Parasympathetic)
  29. Nerve Regulation of MAP
    • Baroreceptors- detect arteriol stretch
    • Cardiovascular Center --> Medulla Oblongata --Receives baroreceptor signals
  30. What would a drop in MAP cause from a regulation stand point?
    Increase in cardiovascular activity via sympathetic n parasympathetic activity.
  31. Two types of capilleries?
    Coninuous & Fenestrated
  32. MET Arterioles
    Bypass from arteries to veins.
  33. How do proteins exchange in capillaries?
    Transcytosis
  34. What is the equation for net filtration pressure?
    NFP=(Capillary Hydrostatic-Interstitial Hydrostatic) - (Capillary Osmotic- Intersitilal Osmotic)
  35. What does starlings law say?
    Heart automatically adjusts to acommadate blood volume.

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