unit 1.8: energy systems in muscle cells Flashcards
(18 cards)
when does lactate metabolism occur
during vigorous exercise
why does lactate metabolism occur
insufficient oxygen for citric acid cycle and ETC
what is pyruvate converted to under anaerobic conditions
lactate
what is the process called for conversion of lactate
fermentation
what does NADH do in lactate metabolism
NADH passed ions and electrons to pyruvate converting it to lactate and converting back to NAD so more ATP can be produced in glycolysis
what happens when lactate accumulates
muscle fatigue
discomfort
pain
what happens when exercise is complete
oxygen debt is repaid
lactate converts back to pyruvate and glucose in the liver
what are the 2 types of muscle fibres
slow twitch
fast twitch
what are examples of activities best suited for slow twitch
long distance running
cycling
cross country skiing
what are examples of activities best suited for fast twitch
weightlifting
sprinting
how long are muscle contractions in slow twitch
long
how long are muscle contractions in fast twitch
quick
what do slow twitch fibre contain
many mitochondria in cells
large blood supply
high concentration of oxygen storing protein myoglobin
what do fast twitch fibre contain
fewer mitochondria
lower blood supply
where do slow twitch fibres get their energy
fats
where do fast twitch fibres get their energy
glycogen
what respiration do slow twitch fibres undergo
aerobic respiration
what respiration do fast twitch fibres undergo
anaerobic
(glycolysis only)
