Skeletal muscle system
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23 terms
Terms | Definitions |
|---|---|
 Fascicle | a discrete bundle of muscle cells |
| perimysium | Connective tissue surrounding a fascicle |
| Epimysium | Connective tissue layer surrounding an individual muscle |
| Sarcolemma | The specific name of the cell membrane of a muscle fiber |
| Sarcoplasmic reticulum | specialized endoplasmic reticulum of muscle cells that stores Ca+ |
| Terminal Cisternae | Sac like structures that surround both side of a T-Tubule serves as reserivors for calcium ions |
| T-tubule | an invagination of the sarcolemma that projects deep into the muscle cell's interior |
| Triad | a Three unit group of one t-tubule lying adjacent between two Terminal Cisternae |
| Myofibril | one of many contractile filaments that make up a striated muscle fiber |
| Myofilaments | Contractile proteins that slide pass one another |
| a bands | dark bands of the muscle made of myosin |
| I band | lights bands gets smaller when muscle contacts |
| Z line | discets the Light bands (I bands) |
| H zone | at the M-line that gets shorter as the muscle contracts like the I-band |
| neuromuscular junction | specialized synaptic junction btw a motor neuron and a skeletal muscle fiber |
| graded and depolarized | The motor end-plate potential generated by the synaptic release of acetylcholine (ACh) is always |
| suprathreshold | the amplituded of the end plate potential is always |
| depolarizes | when a motor neuron _______ ACh is released and the muscle fiber attached to it contracts |
| True | During muscle contraction, cytosolic Ca2+is high, allowing actin and myosin to interact. Ca2+ binding induces a conformational change in the thin filament and its regulatory proteins exposing the myosin-binding site on actin. |
| true | During muscle relaxation, cytosolic Ca2+is low and tropomyosin is covering the myosin-binding site on acting preventing cross-bridge formation. The binding site of Ca2+ is on troponin. |
| true | In skeletal muscle, an action potential traveling down a t-tubule will result in the opening of an intracellular ion channel followed by the conformational change of the thin filament. |
| nebulin | protein anchored at Z-line and runs length of actin filament |
| titin | anchors the actin molecule and is the largest known protein in humans |
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