BM_N2

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Author:
ChrisC
ID:
65375
Filename:
BM_N2
Updated:
2011-02-10 19:25:42
Tags:
Bio Mechanical
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Description:
Bio Mechanical Engineering
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  1. What is the equation for vessel bifurcation?
    n = VinAin/VoAo

    Atot,daughter = 1.25 Aparent
  2. What is the division of the vessels?
    • Aorta (25mm)->Arteries(4mm)->Arterials(20micro)->Capillaries(3micro)
    • ->Venules(20micro)->Veins(5mm)->Vena Cava(30mm)
  3. What percentage of blood is red blood cells?
    45%
  4. Name 4 issues with modeling blood flow.
    • 1) Flow has an unsteady component.
    • 2) Small vessels are particular flow not continuum (Dv > 50 Drbc)
    • 3) Complex shapes such as branching and tapering.
    • 4) Short tube lengths (Reflections)
  5. Give the three things caused by the velocity gradient in the arteries.
    • 1) Red blood cells tend to tumble.
    • 2) The membrane rotates around the cell (Tank Treading)
    • 3) Due to Bernoulli's principal the pressure is higher above the cell forcing itg to the center of the artery (Axial Streaming)
  6. What are the components of blood pressure.
    • 1) DC (Steady) pressure associated with stretch (Compliance) of the large blood vessels
    • 2) AC (Unsteady) pressure associated with bolus blood injection from the heart.
    • 3) Hydrostatic pressure due to change in height (P = rho*g*h)
  7. What are the parts of the artery wall (inside to outside)?
    • 1) Endothelial cells
    • 2) Basement membrane
    • 3) Internal elastic lamellae (Elastin, E ~10^6)
    • 4) Smooth muscle (Contraction, synthesis)
    • 5) Crimped Collagen (E ~10^9-10^10)

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