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29 Cards in this Set
- Front
- Back
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Smooth
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found in intestine, blood vessels, no striations, fibers tapered at ends involutary
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Cardiac
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Striated, cylindrical, branched intercalated disks, involuntary
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Intercalated disks
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junctions between fibers
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Skeletal
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striated, cylindrical
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Functions of Skeletal muscle
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movement, posture, heat production
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movement
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contract, relax, pull on bone
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origin
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attatchement to less movable bone
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insertion
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attatchement to more movable bone
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tendons
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parts of muscle that attatch to bone
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bursae
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fluid filled sac between tendon and bone
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prime mover
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main cause of movement
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synergists
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help the prime mover
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antagonists
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move opposite prime mover
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posture
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holding body in way causes lest stress, tonic contration
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tonic contraction
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only some fibers contract causing no movement and holds muscles in position
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heat production
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muscle contraction maintains body temp
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Structure of Skeletal muscle
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muscle, bundle of muscle fibers, muscle fiber, myofibril, myofilaments, sarcomere
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Myofilaments
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actin (thin), myosin (thick)
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Z-disk
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connects sarcomere to sarcomere
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I band
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area with only actin
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A band
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actin and myosin present
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h zone
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are with only myosin
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twitch
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jerky response, seen in isolated muscles
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Isotonic
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movement at joint, muscle shortens, insertion moves toward origin
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Isometric
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no movement, no shortening muscle, increased tension
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Benefits of exercise
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improved muscle tone, posture, efficient heart/lung function,
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Hypertrophy
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increase in muscle size due to strength training, increasing myofilaments
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Endurance training
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no hypertrophy, increase in blood vessels, increase in mitochondria
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Atrophy
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decrease in muscle size
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