Anatomy - Muscular S Word Scramble
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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 |
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