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23 Cards in this Set
- Front
- Back
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Skeletal Muscle |
Muscle that attaches to the skeleton or associated connective tissue Shapes the body Gives ability to move (Voluntary) |
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Fibers |
long cylindrical cells that make up skeletal muscle are multinucleated |
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Myofibrils |
Make up Fibers give muscle cells stripped appearance pushes the nuclei peripherally |
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Myofilaments |
make up myofibrils two types : actin and myosin |
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Actin & Myosin |
contractile proteins located in myofilaments |
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Sacromeres |
The contractile units of the muscle. extend from the middle of one I band ( Z disc) to the middle of the next along the microfibril |
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Thin and Thick Filaments |
bands of actin and myosin |
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Transverse tubule (T tubule) |
where the sacrolemma indents into the muscle cell This allows for the electrical signal to penetrate the sacrolemma |
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Terminal cisterns |
The channels that cross the transverse tubules |
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Sarcoplasmic reticulum (SR) |
the smooth endoplasmic reticulum of the skeletal muscle |
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Triads |
Regions where the SR terminal cisterns border a T tubule on each side |
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Endomysium |
Areolar connective tissue that surrounds each muscle fiber |
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Fascicle |
A bundle of muscle fibers
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Perimysium |
collagenic membrane that surrounds the fasicle |
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Epimysium |
a much coarser "overcoat" of dense connective tissue that binds a large number of fasicles |
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Deep Fascia |
coarser sheets of dense connective tissue that binds muscles into functional groups |
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Tendon |
Attach muscle to bond |
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Aponeuroses |
"sheetlike" attaches muscles to each other or indirectly to bones |
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Insertion |
A muscle's more movable attachment |
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Origin |
fixed, immovable attachment
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Neuromuscular ( myonerual) junction |
The junction between an axon of a motor neuron and a muscle cell |
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Motor Unit |
The functional structure that consists of a neuron and muscle fibers |
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Synaptic Cleft |
A small fluid-filled gap that separates the neuron from the muscle fibers |
