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Anatomy - Muscular S
Muscular System
| Question | Answer |
|---|---|
| Connective tissue surrounding a fascicle | Perimysium |
| Connective tissue ensheathing the entire muscle | Epimysium |
| Contractile unit of muscle | Sarcomere |
| A muscle Cell | Fiber |
| Thin connective tissue investing each muscle cell | Endomysium |
| Plasma membrane of the muscle cell | Sarcolemma |
| A long, filamentous organelle found within muscle cells that has a banded appearance | Myofilament |
| Actin- or myosin-containing structure | Myofibril |
| Cordlike extension of connective tissue beyond the muscle, serving to attach it to the bone | Tendon |
| A discrete bundle of muscle cells | Fascicle |
| Outside epimysium | fascia |
| Only actin, spans Z-line and ends at myosin | I-Band |
| Length of the myosin | A-Band |
| Only myosin in the center | H-Zone |
| Myosin anchored in - cell membrane | M-Line |
| Time between application to a motor neuron and beginning of contraction | Lag Phase |
| Time of Contraction | Contraction Phase |
| Occurs immediately after contraction phase - dont always get this | Relaxation Phase |
| Contraction of an entire muscle in response to a stimulus that causes an action potential in one or more fibers | Muscle Twitch |
| Sufficient strength of a stimulus to create an ALL OR NONE RESPONSE | Threshold |
| When actine and myosin filaments slide past one another causing sarcomeres to shorten | Sliding Filament Mechanism |
| Charge difference | Resting Membrane Potential |
| Back to resting/fast - 50 times a second | Repolarization |
| Causes cell to become permeable to sodium ions | Depolarization |
| Rapid depolarization and repolaration, results in muscle contraction | Action Potential |
| carry action potentials to skeletal muscle fibers | Motor Neurons |
| Between nerve cells or between nerve cell and effector cell (muscle or gland) | Synapse |
| Single motor neuron and all of the muscle fibers it innervates, many per muscle | Motor Unit |
| Axon | Presynaptic Terminal |
| Space between the musclefiber and nerve | Synaptic Cleft |
| Muscle fiber membrane | Postsynaptic Membrane |
| Contain Acetylcholine | Synaptic Vesicles |
| Increase number of motor neurons activated | Recruitment |
| When muscle remains contracted between stimuli - no relaxation phase | Tetanus |
| Amount of tension increases during contraction but length of muscle does not change - muscle strength | Isometric |
| Amount of tension is constant but length of muscle decreases | Isotonic |
| Constant tension of muscle fibers for long periods of time | Muscle Tone |
| Contract quickly and fatigue quickly | Fast-Twitch fibers |
Created by:
kate87655
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