Term
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Definition
| anchor for thin filaments |
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Term
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Definition
| anchor for thick filaments |
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Term
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Definition
| dark area; extends length of the thick filaments |
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Term
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Definition
| light area; thin myofilaments only (Z disc is center) |
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Term
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Definition
| thick myfilaments only (M line is center) |
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Term
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Definition
| functional unit of skeletal muscle; Z disc to Z disc; aligned end to end within myofibril |
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Term
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Definition
| Makes up thick filaments; has rodlike tail and two globular heads which contain binding sites for actin and ATP |
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Term
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Definition
| Makes up thin filaments; made of G-actin |
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Term
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Definition
| Contain binding sites for myosin heads |
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Term
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Definition
| In thin filaments; rod-shaped protein that runs along actin; blocks myosin-binding sites on actin when muscle is relaxed |
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Term
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Definition
In thin filaments; 3 polypeptide subunit complex
-1 subunit bound to actin
-1 subunit bound to tropomyosin
-1 subunit binds Ca2+ |
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Term
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Definition
| Stores and regulates intracellular Ca2+ |
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Term
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Definition
| perpendicular tubes of the sarcoplasmic reticulum |
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Term
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Definition
| invaginations of sarcolemma; "transverse" tubules |
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Term
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Definition
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Term
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Definition
| part of the axon terminal that contains acetylcholine (ACh) |
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Term
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Definition
| space between axon terminal and sarcolemma |
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Term
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Definition
| specialized area of muscle fiber that synapses with axon terminal |
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Term
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Definition
| component of motor end plate that has ACh receptors |
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Term
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Definition
| opens when membrane potential changes |
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Term
| chemically (ligand) gated channel |
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Definition
| opens when a chemical binds |
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Term
| Mechanically gates channel |
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Definition
| open in response to mechanial movement |
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Term
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Definition
| membrane potential becomes less negative |
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Term
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Definition
| initial depolarization of motor end plate |
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