Where must muscles cross to move a bone
All muscles must cross a joint
What is the origin
Where the muscle attaches to immovable bone
What do many bones and muscles work together to form
Levers
What do our bones form and where do they turn about
Rigid structure
Fulcrum
What are levers used to do
Make small amounts of force into much larger forces
What are the 4 parts of a lever
Lever arms
Fulcrum
Effort
Load
What in the body is the lever arms
Bones
What in the body is the fulcrum
Joints
What in the body is the effort
Muscles provide effort to move loads of
What in the body is the load
Often weight of body parts that are moved
Or forces needed to lift, pull, push things like weights
Examples of effort in body
Buceps
How many first class levers are there in the body
One
What is the one first class levers used in the body
Neck
Order of parts in first class levers
EFL- effort, fulcrum, load
Another work for fulcrum
Pivot
Examples of first class levers and direction arrows go in
Neck muscles when heading a ball in football
E- neck muscles-(going down)
F-joint at base of skull(up)
L-weight of head(down)
What direction does the effort have to go in
Any - but muscles will always pull
Another sporting example of first class levers
Rowing stroke
E-the handle
F-the gate
L-the water
How many second class levers in body
One - ankle/foot joint
Order of parts in second class levers
ELF
Effort, lever, fulcrum
Example of second class levers and direction of arrows
At ankle- jumping for a rebound in netball
E- gastrocnemius pulling in heel (up)
L-body weight (down)
F- ball of foot (up)
When does second class levers occur
When load is between effort and fulcrum
When does a first class levers used occur
Where fulcrum is between effort and load
How many joints in the body are third class levers
Every other one than ankle and neck
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