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20 Cards in this Set
- Front
- Back
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muscle fibers
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all muscle cells
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skeletal muscle fibers
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in organs called skeletal muscles that attach to bodys skeleton
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endomysium
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delicate connective tissue
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smooth muscle
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no striations, involuntary, in hollow organs
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cardiac muscle
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only found in heart, pumps blood
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sarcolemma
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plasma membrane
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motor unit
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one neuron and all the skeletal muscles cells it stimulates
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synaptic cleft
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gap between nerve endings and muscle cells
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thin filaments
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composed of actin
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think filaments
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made of myosin
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muscular system
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applies specifically to skeletal muscle
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4 important muscle roles
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produce movement, maintain posture, stabilize joints, generate heat
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aponeuroses
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attach muscles to bone, cartilage
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fascicle
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bundle of fibers
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cross bridges
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myosin heads
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sarcoplasmic reticulum
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specialized smooth endoplasmic reticulum
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neurotransmitter
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released when nerve impulse reaches axonal terminals
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action potential
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conducts electrical impulse from one end of cell to another
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graded responses
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different degrees of shortening
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creatine phosphate
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energy molecule
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