Muscle Twitch Fibres Flashcards
how do FT fibres contract?
quickly but rapidly fatigue as they consume a lot of energy
what are animals with FT fibres good at?
sprinting & jumping
why are animals with FT fibres good at sprinting & jumping?
muscles contract quickly
what type of respiration do animals with FT fibres use?
anaerobic
describe FT fibres.
lighter in colour than ST fibres
why do FT fibres look as they do?
lower density of capillaries as they do not rely on O2
what does anaerobic respiration allow in FT fibres?
rapid generation of energy (ATP)
lower density of mitochondria
how do ST fibres contract?
slowly but go for long time without getting tired
what are animals with ST fibres good at?
long distance running
why are animals with ST fibres good at long distance running?
muscle fibres contract slowly but go for a long time
describe ST fibres.
red in colour
why do ST fibres look as they do?
contain many blood vessels
what type of respiration do ST muscles use?
aerobic
what does aerobic respiration provide animals with ST fibres?
need a lot of O2 to contract muscle
high density of mitochondria
describe anaerobic respiration.
respiration without oxygen. its a short term energy production method that animals use when they can’t exchange enough oxygen to carry out aerobic respiration
describe aerobic respiration.
release of energy from the breakdown of glucose by combining with oxygen.
is aerobic or anaerobic more efficient?
aerobic
where does aerobic respiration happen?
in the mitochondria of the cells
why is energy used in aerobic respiration?
enables muscles to contract and allows movement
where does anaerobic respiration happen in the cells?
cytoplasm
what does anaerobic leave in the body?
lactic acid - poisonous (can stop muscles working & cause pain)
