Architectue Of Musculoskeletal System Flashcards
In a class 1 lever, where is the fulcrum located?
In the middle of the resistance and applied force
In a class 2 lever, where is the load located?
In between the fulcrum and the applied force
What are class 1 levers often referred to based on how they move?
See saw
What are class 2 levers often referred to based on how they move?
Wheelbarrow
Which kind of lever is the occipital joint (paired symettrical articulation between the cervical shape and the base of the skull)
Class 1 lever
Outline how a class 1 lever works using the Atlanto-occipital joint as an example
It balances the head as the centre of the mass is anterior of that joint and the muscles on the posterior side of your neck are going to be balancing that out
Outline how a class 2 lever works in terms of how far away the force is applied
Hint: Wheelbarrow
Class 2 levers apply force much further away from the fulcrum than the position where the resistance is applying its force
Outline why class 3 levers cause muscle to have a mechanical disadvantage
The resistance is further away from the fulcrum and the applied force is less
Where is the applied force located in a class 3 lever?
In between the fulcrum and the resistance
Which class of lever are most of our long bones?
Class 3 lever
What makes a lever have a mechanical advantage?
When the applied force is further away from the axis than the resistance
Why can our calves raise so much weight?
Because its a class 2 lever and has a mechanical advantage because the applied force is further away from the axis than the resistance
What happens to the moment arm when we raise our calves?
The resistance is going right through the joint to minimise the moment arm
