Muscle Construction Flashcards
(35 cards)
functions of muscular system
movement
heat
posture
guard entrances and exits
muscle names refer to
location
size
shape
number of heads
function
origin and insertion
origin
attatchment to more stable bone
inseriton
attachment to moveable bone
agonist/ prime mover
innitiates a particular movement or main muscle that performs action
synergist
assists movement of agonist
antagonist
muscle does opposite of agonist
Skeletal muscle
connective tissue comprised of actin and myosin proteins
endomysium (CT)
creates muscle cells (individual)
perimysium (CT)
bundle of muscle cells, creates fasicle
epimysium (CT)
CT covering whole muscle
functional unit of muscle cells
sarcomere
z- lines
divide sarcomere
come closer during contraction
actin
thin filament
anchored to z-line
myosin
thick filament
between actin and z-lines
when muscle contracts
actin slides along myosin and z-lines move closer together, muscle cell shortens
motor unit
muscle fiber and neuron it is attatched to
motor nerve
innervates muscle fiber
sensory nerve
receives outside stimulus and sends to nervous system
proprioceptive nerve
tells you where you are in space
all or non principle
when muscle cell contracts, it will give its all
muscles determine how many to contract to meet needs
twitch contraction
quick and jerky
latent phase (twitch)
muscle contracts fraction of a second after recieving stimulus
contraction (twitch)
muscle fiber shortens and tightens
