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Transcript 
Muscles
Chapter 10
Fasicle
arrangement
Physics of levers
Torque
Torque = Force x Lever length
or

l
A human example
There are 3 types of lever
systems
1. First Class - fulcrum between load and
effort
2. Second Class - load is between fulcrum
and effort
3. Third Class - effort is between load and
fulcrum
First Class Lever Systems
The classic “see-saw” or teeter totter of your youth
Second Class Lever Systems
Third Class Lever Systems
Most muscle/joint systems fall into this catagory
Muscles:
anterior
Muscles:
posterior
Muscles of
the Hip &
Thigh
(anterior view)
The
Adductor
brevis
The
Gluteus
minimus
The erector spinae
Erector spinae
Up next …
Nervous System Histology
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