spinal bio quiz 2 Flashcards
The measure of mechanical efficiencyof a lever system
mechanicl advantage
Dependends on type of lever system & relationship between torque of external force and torque of muscular force (determined by length of MAs)
(M Ad= EA/RA)
mechanical advantage
Always at mechanical disadvantage
Effort force always exceeds resistance force magnitue
M Ad <1
3rd class levers
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3rd class lever
Always at mechanical advantage
effort force magnitude can be less than resistance force magnitude but doesnt have to be
M Ad > 1
EA>RA
2nd class levers
can be at mechanical advantage, disadvantage or neutral.
often more at disadvantage
1st class lever
one end of segment or set of segments is free to move in space
open chain
both ends of a segment are constrained and not free to move in space
ex. leg presses against foot plate
closed chain
Human CT & joints depend on_ _
to assume final form.
function
the function of a joint is both dependant on and affects?
structure and composition
mobility of a joint is inversely related to ?
joint stability
every change in the function of a bone is followed by certain definite chages in its internal architecture and external conformation
wolff’s law
bone and collagen have electrical fields which exhibit something called
piezoelectric properties
anode effect
increased tension
cathode effect
increased compression
