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Topic 7 - Muscle fibres

topic-7-muscle-fibres

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What type of substance is myoglobin?

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What is myoglobin?

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When does myoglobin release oxygen?

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What do fast-twitch fibres allow muscles to do?

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What do slow-twitch fibres allow muscles to do?

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Which type of muscle fibre is paler?

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Where is the ATP made that is used in fast muscle contractions?

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Which type of muscle fibre is darker?

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What type of respiration do slow-twitch fibres usually use?

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Complete the gaps in the paragraph about slow-twitch and fast-twitch muscle fibres

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Slow-twitch fibres are quite dark because they have lots of

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whilst fast-twitch fibres are usually

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There are many

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present in slow-twitch fibres to accommodate for the aerobic respiration.

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Fast-twitch fibres have less mitochondria because

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doesn't require them.

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Fast-twitch fibres have a lot of

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because lots of Ca+ ions need to be released for intense contractions.

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Slow twitch fibres don't have much glycogen because they don't respire

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Fast-twitch fibres have less

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because there is a lower demand for oxygen.

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fibres fatigue more quickly.

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