BRAINCAKEMyosin
A myosin molecule has a long tail and a hinged globular head which allows the head to move back and forwards and bend. The head has binding sites for ATP and actin. The tails align in parallel to form a myosin filament.
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Key terms in this lesson
- sarcomere
- The contractile unit of a myofibril, delineated by two Z-lines, containing overlapping actin and myosin filaments.
- actin
- A thin protein myofilament in a myofibril that, together with myosin, slides during muscle contraction; its myosin-binding sites are covered by tropomyosin in resting muscle.
- ATP
- Adenosine triphosphate, the universal energy currency of cells, formed by adding an inorganic phosphate to ADP and hydrolysed to release energy for cellular reactions.