PSY/CS330 Human Factors
01/11/2001
Day 1-4
The Muscular System
uThe
Striated Muscle (those responsible for voluntary movements)
lAnatomy
- Two types of fibers
uExtrafusal
Fiber: these fibers do the work of the muscle.
uIntrafusal Fiber or Muscle Spindle: controls muscle
tone and
provides important sensory information.
lContraction
uControlled
by the nervous system
uMuscles
only shorten (i.e., only go one direction)
uOrganized
in opposition pairs.