Can anyone explain contraction of muscles?
Answers
The sliding filament theory explains the process of muscle contraction,
The myosin heads or cross bridges come in close contact with the thin filaments.
The thin filaments are pulled towards the middle of the sarcomere.
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♠ CONTRACTION OF MUSCLES
♥It is the process of force-generationin the fibres of any class of muscle, by the interaction of myosinhead-groups in the thick filaments with actin molecules in one of the immediately neighbouring thin filaments.
♥ This is set in train ('activated') by a rise in the concentration of calcium ions [Ca2+] in the muscle fibre cytoplasm in all types of muscle, but the mechanism for this rise differs in important respects between them.
♥ With reference to skeletal muscle, 'contraction', though literally implying shortening, is used to describe force-generation,
♥ Whether it actually results in shortening (concentric action),
♥ Tension without movement (isometric action)
♥ or Even lengthening against the muscle's own resistance (eccentric action);
♥The last is sometimes called an 'eccentric contraction' or, a 'lengthening contraction' - paradoxical usages better avoided.
