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Muscles
How muscles work .
16 cards·by vicctoriaah
epimysium
surrounds skeletal muscle and all fascicles in a muscle
preimysium
surrounds individual fascicles and separates muscle into small compatments
endomysium
surround individual muscle fibers
sarcolemma
cell membrane of a muscle fiber (cell)
sarcoplasm
cytoplasm of a muscle fiber (cell)
myofibril
threads of protein inside the sarcoplams
myosin
thick protein filament inside a myofibril
actin
thin protein filament inside a myofibril
I band
actin filaments attached to z-lines
Z line
protein to which actin binds
A band
region where myosin overlaps actin
sarcomere
unit of muscle from z-line to z-line
motor neuron
nerve cell that connects to muscle fibers
neuromuscular junction
connection between motor neuron and muscle fiber
neurotransmitters
chemicals that go from neuron to muscle fibers
motor unit
consist of motor neuron and a muscle fiber