Biomechanics Exam 3 ACTUAL QUESTIONS AND CORRECT ANSWERS

Biomechanics Exam 3 ACTUAL
QUESTIONS AND CORRECT ANSWERS
cortical shell - CORRECT ANSWERS very dense F-actin network under
lipid bilayer in WBCs (100-300 nm)


WBC interior - CORRECT ANSWERS f-actin cytoskeleton
liquid cytoplasm
microtubules
nucleus


creep response WBC - CORRECT ANSWERS - dashpot and spring in
series parallel to second spring
- initial displacement to Lp (dP/ (k1+k0) is unwrinkling of cortical shell
then creep


critical threshold tension - CORRECT ANSWERS no deformation until
membrane tension greater


tendons vs ligaments - CORRECT ANSWERS t- bone to muscle
l- bone to bone


connective tissue structure - CORRECT ANSWERS - water is 50-75
percent of mass
- cellular components : fibroblasts and vascular cells
- solid proteins


fibroblasts - CORRECT ANSWERS In connective tissue, cells that
secrete the proteins of the fibers and matrix.

, - mechanosensitive


elastin - CORRECT ANSWERS protein base similar to collagen that
forms elastic tissue
responsible for extensibility and some loading
- store energy when loaded
- crosslinked


Collagen - CORRECT ANSWERS - 60 - 85 percent dry weight in
connective tissues
- primary structural compenets
- alpha chain
- 3 alpha chain is tropocollagen


proteoglycans - CORRECT ANSWERS bind GAGs (hydration because
polar)
- lubrication and spacing


Tendon/Ligament Structure - CORRECT ANSWERS multiple
microfibrils in one fibril
- waveform or crimp structure unstretched


Stress-Strain Curve - CORRECT ANSWERS - toe region (unloaded,
waveform structure) - elastin bears the load
- elastic region (linear phase) slope is Youngs Modulus
- yield stress at end of linear region (start of plastic region) and breaking
- ultimate stress then complete failure