This series of 3 lessons have been written to cover the content of point 5.1.5 (l) (i) of the OCR A-level biology A specification, which is The structure of mammalian muscle and the mechanism of muscular contraction. The lessons consider the structural and functional differences between skeletal, cardiac and smooth muscle, the connection between motor neurones and muscle fibres and how actin slides over myosin in the sliding filament model of muscular contraction.

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