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31 Cards in this Set
- Front
- Back
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Function of muscles
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movement or body parts and organs
stability - maintain posture and prevent movement communication- speech, expression, and writing control of openings and passagways heat production |
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Fasicles
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large bundles of muscle fibers
multiple fasicles form a muscle |
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Endomycia
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layer of connective tisue around each cell (thin aerolar) allows room for cappilaries and nerve fibers.
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perimycium
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connective tissue around fasicles
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Epimycium
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covers whole muscle
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fascia
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belly blends into CT between muscle
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Skeletal Muscle Belly
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thicker middle region of muscle
Belly gets fatter, as a muscle gets shorter |
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Skeletal Muscle Origin
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attachemtn to stationary end of muscle( bone thats not moving)
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Skeletal Muscle Origin
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attachemtn to stationary end of muscle( bone thats not moving)
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Insertion
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attachment to mobile end of muscle( bone that is moving)
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Skeletal muscle Shapes
Fusiform |
Thick in middle and tapers at end
biceps in brachii |
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Skeletal muscle Shapes
paralell muscles |
have paralell fasicles
rectus abdominus |
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Skeletal muscle Shapes
Convergent muscle |
broad ar origin and tapering to a narrower intersection
Converge- come together |
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Skeletal muscle Shapes
Pennate muscle |
Feather Shaped
fasicles insert obliqely on a tendon unipenate, bipenate, multipenate palmar interosseous, rectus femoalis, and deltoid |
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Skeletal muscle Shapes
circular muscles |
ring around body opening
orbicularis oculi |
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Prime mover/ agonis
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produces most of the force
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Synergist
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aids the prime mover
stabalizes nearby joints modifies the direction of movement |
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Antagonist
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opposes the prime mover.
prevents excessive movement and injury |
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fixator
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prevents movement of a bone
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Intrinsic muscle
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located in the same place the movement is happening
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extrinsix muscle
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located away from the movement area
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characteristic of muscles
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muscle cells convert chemical energy(ATP) into mechanical energy of movement
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Responsiveness/ excitability
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two chemical signals, stretch and eletrical changes across the plasma membrane
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conductivity
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local electrical change triggers a wave of excitation that travels along the muscle fiber
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contractability
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shortens when stimulated
muscles the only tissue that shortens when stimulated |
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extensibility
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capanle of stretching
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elasticity
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returns to its iriginal reting length after being stretched
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generalized skeletal Muscle
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voluntary striated muscle attached to bones
as long as 30 cm light and dark striations(reflects overlapping of intrcontractile proteins) under consious control |
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muscle cells
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multiple flattened muclei inside cell membrane
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sarcolema
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plasma membrane of muscle cell
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Transverse(T) Tubules
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Run through the cell and through the other end
carries electrical currents to cell interior |
