muscle structure Flashcards
what type of muscle is smooth muscle
involuntary
what type of muscle is skeletal muscle
voluntary
what makes up a muscle
muscle fibre
what makes up muscle fibre
myofibril
what are myofibral made up of
filimants
what are filiments made up of
sarcomeres
what are the two types of filiments
actin
myosin
describe the structure actin filiment
thinner
consists of two strands twisted around each other
describe the myosin filiment
thicker
consists of long shaped rod tails with bulbous heads that project to the sides
what are the two parts of the sacromere
a band
i band
what colour is the a band
dark
why is the a band dark
thick filiments
has both actin and myosin
what colour is the i band
light
why is the i band light
only contains actin
what is sarcoplams
cytoplasm of muscle fibre
what is sarcolema
cell membrane of muscle fibre
what are the two types of muscle fibre
slow twich fibres
fast twich fibres
what are slow twich fibres best for
endurance
why are slow twich fibres best for endurance
lots of mitochondria
lots of myoglobin
what are fast twich fibres best for
short bursts of energy
why are fast twich fibres best for short bursts of energy
release energy much quicker
more powerfull
what do twich fibres do
anaerobic respiration
what does this form of respiration produce
lactic acid
what does this build-up of lactic acid mean
fatigue occurs easily
what is the structural make up of muscle from biggest t smallest
muscle- muscle fiber -myofibiral-filiments-scarcoplasm
what are the ends of each sarcomere marked with
z- line
where is the m line on a diagram of a sarcomere
the middle of the saromere
what happens to the structure of sarcomere during contraction
h-zone and i-band get shorter
a- band stays the same length
