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Area which disappears when muscle contracts
Interconnecting tubes which store calcium ions
Divide one sarcomere from the next.
Part of muscle fibre containing sarcomeres, myosin and actin.
Thick protein filament
Thin protein filament
Globular protein which calcium ions bind to.
Thread-like protein that winds around actin.
Released from sarcoplasmic reticulum to initiate muscle contraction
Electrical impulse travels down here and into sarcoplasmic reticulum
Enzyme involved in the breakdown of ATP
The action of the mysoin heads pulling actin.
A structural characteristic of slow twitch fibres
A functional characteristic of slow twitch fibres
A structural characteristic of fast twitch fibres
A functional characteristic of fast twitch fibres
All of the muscle fibres within a motor unit either contract or do not contract, there is no 'partial contraction.'
A motor neurone and its muscle fibres
Changes in strength of contraction are brought about by altering the number and size of motor units involved.
Muscle fibre type likely to be an advantage for 100m sprinters
Muscle fibre types likely to be an advantage for marathon runners