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Anatomy - Muscular S

Muscular System

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