biomechanic of msk

Question 1

what is the angle of pull

Answer 1

angle form by the muscle force vector relative to the bone on which the muscle is attached

Form by the muscle and the point of attachement on the bone

Question 2

the angle of pull varie from

Answer 2

joint angle and with O/I of muscle
As the joint angle change the angle of muscle pull change too

Question 3

which componement of the muscle force never passes throught the axis of rotation and what type of component it is

Answer 3

vertical/perpendicular
Rotatoru component

Question 4

which component always pass through the axis of rotation

Answer 4

horizontal/parallel
stabilizing/destabilizing component

Question 5

which vector component always need a moment arm

Answer 5

perpendicular/vertical

Question 6

which component is a torque-producing

Answer 6

perpendicular/vertical

Question 7

why is there no moment arm in the horizontal component

Answer 7

bc there is no distance btw the axis of rotation and the line of action

can only cause linear motion

Question 7

why is there no moment arm in the horizontal component

Answer 7

bc there is no distance btw the axis of rotation and the line of action

can only cause linear motion

Question 8

what does affects the relative magnitude of the perpendicular and parallel component of the resultant vector

Answer 8

angle of pull

Question 9

what happen with the rotatory component and the stabilizing component when the angle of pull increase

Answer 9

rotatory increase and stabilizing decrease

Question 10

the hamstring are rotatory or stabilizing

Answer 10

rotatory

Question 11

the gastroc are rotatory or stabilizing

Answer 11

stabilizing

Question 12

popliteus is rotatory or stabilizing

Answer 12

some rotatory but primary function is stabilizing

Question 13

bicep is rotatory or stabilizing

Answer 13

rotatory

Question 14

brachioradialis

Answer 14

stabilizing

Question 15

brachialis

Answer 15

some rotatory but primary function is stabilizing

Question 16

the human system is a _ chain, a system of linked _ subject to _ application

Answer 16

kinetic, rigid bodies, force

Question 17

where is located the motive force (muscle)

Answer 17

btw the fulcrum (joint) and resistive force (segment)

Question 18

function of the motive force

Answer 18

used to gain an advantage in linear
rom and velocity of mvt

Question 19

motive force has a short or long moment arm + why

Answer 19

short, bc the moment arm of the resistive force is larger than the motive force, its linear distance traveled is large relative to it motive end of the lever

Question 20

how can we compensate the mechanical disadvantage create by the third lever system

Answer 20

reduce mass and keep the mass close to the axis of rotation