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Sliding Filament theory Myosin and actin overlapping nature On the filament are special sites to which myosin attach
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Sliding Filament theory * Myosin and actin overlapping nature * On the filament are special sites to which myosin attach * At rest, this prevented by 2 other protein Toponin and tropomyosin * When muscles are active, calcium Ions are released which expose the myosin to active sites * Myosin joins the Actin " Cross-bridging' Myosin must be "Activated" by energy from respiration * Myosin heard rocks and pulls actin over it. almost straight away they realise and attach site i.e. the muscle shortens, hence contraction 1000's of filaments do this, what problems might arise if it doesn't occur properly? Slippage will occur Transmission of neural impulse * Involves electrical signal * At rest the neurone is positive outside and negative inside. This is resting potential * When a neurone receives instructions from the central nerves system, sodium ion enter the neurone causing the inside tab come and outside * This is called action potential * As less sodium enters the neurone...
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