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24 Cards in this Set
- Front
- Back
Endomysium
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The delicate connective tissue sheath that encloses each muscle fiber.
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Perimysium
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A coarser fibrous membrane that wraps several sheathed fibers
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Fascicle
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A bundle of fibers
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Epimysium
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A tougher overcoat of connective tissue that binds many fascicles together
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Sarcolemma
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The plasma membrane in muscle cells
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Sarcomeres
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Chains of tiny contractile units which are aligned end to end along the length of myofibrils
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Thick filaments
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also called myosin filaments - they are made mostly of bundled molecules of the protein myosin but also contain ATPase enzymes which split ATP to generate the power for muscle contraction.
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Thin filaments
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Composed of the contractile protein actin plus some regulatory proteins that play a role in allowing or preventing myosin head binding to actin
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Sarcoplasmic Reticulum
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a muscle fiber organelle - it is a specialized smooth endoplasmic reticulum
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Motor Unit
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One neuron and all of the skeletal muscle cells it stimulates.
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Neuromuscular Junction
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the region where a motor neuron comes into close contact with a skeletal muscle cell.
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Synaptic Cleft
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the gap between the nerve endings and the muscle cells membranes.
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Acetylcholine
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the specific neurotransmitter that stimulates skeletal muscle cells.
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Creatine Phosphate
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a unique high energy molecule found in muscle cells but not other cell types
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Muscle Fatigue
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a condition in which a muscle loses its ability to contract as a result of overactivity. It is usually a period after stimulation
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Isotonic Contractions
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muscle contraction without appreciable change in the force of contraction;
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Isometric Contractions
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muscle contraction without appreciable shortening or change in distance between its origin and insertion.
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Muscle Tone
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unconscious low level contraction of your muscles while they are at rest
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Origin
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attachments of a muscle that remains relatively fixed during muscular contraction
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Insertion
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the site of attachment, as of a muscle to the bone that it moves
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Prime Mover
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a muscle that acts directly to produce a desired movement amid other muscles acting simultaneously to produce the same movement indirectly.
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Antagonists
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one that counteracts the action of another muscle
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Synergists
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a muscle or agent which acts with another.
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Fixators
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device that provides rigid immobilization of a fractured bone by means of rods attached to pins that are placed in or through the bone.
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