myosin - thick filament in muscle fibre, actin - thin filament in muscle fibre, muscle fibre - contains numerous myofibrils; a sarcolemma; sarcoplasmic reticulum, myofibril - contains repeating sarcomeres; parallel fibres, M line - middle of sarcomere, H band - centre of A band; myosin only, A band - length of myosin filament, I band - part of sarcomere which is actin only, Skeletal muscle - voluntary muscle; attached to skeletons; conscious control, Smooth muscle - involuntary muscle; lines visera; unconscious control, cardiac muscle - muscle located in heart, Z line - holds actin filaments together; end of sarcomere,

Muscle Structure

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