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29 Cards in this Set

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