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Biology Unit 5
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Topic 7: Run for your life

2. Describe the structure of a muscle fibre and explain
the structural and physiological differences between
fast and slow twitch muscle fibres.
Muscle Structure
There are 3 main types of muscle:

Striated Muscle
Smooth Muscle
Cardiac Muscle

Skeletal Cardiac…

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Biology Unit 5
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Fast-twitch and Slow-twitch Muscle fibres
Slow-twitch Fast-twitch
Specialised for slower, sustained contraction and Specialised to produce rapid, intense
can cope with long periods of exercise contractions in short bursts
Many mitochondria- ATP comes from aerobic Few mitochondria- ATP comes from anaerobic
respiration (ETC) respiration (glycolysis)…


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