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Muscle Structure
Human Bio Deck per.4
16 cards·by Daniel R.
Epimysium
Surrounds skeletal muscle and all fascicles in a muscle
perimysium
Surrounds individual fascicles and seperates muscle into small compartments
Endomysium
Surround individual muscle fibers
Sarcolemma
cell membrane of a musle fiber (cell)
Sarcoplasm
cytoplasm of a muscle fiber (cell)
Myofibril
Threads of protein inside the sarcoplasm
Myosin
Thick protein inside a myofibril
Actin
Thin protein filament inside a myofibril
I band
Actin filaments attached to z-lines
Z-lines
Protein to which actin binds
A band
Region where myosin overlaps actin
Sarcomere
Unit of a muscle from z-line to z-line
Motor neuron
Nerve cell that connects to muscle fiber
Neuromuscular junction
Connection between motor neuron and muscle fiber
Neurotransmitters
Chemicals that go from neuron to muscle fiber
Motor unit
Consists of motor neuron and a muscle fiber