BRAINCAKEA Sarcomere
A sarcomere is the contractile element and functional unit of a myofibril and is delineated by two Z lines.
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Key terms in this lesson
- Myofibril
- A long, cylindrical organelle within a muscle fibre made up of repeating sarcomeres and responsible for muscle contraction.
- Actin
- A thin protein filament in a myofibril that, together with myosin, slides during muscle contraction.
- Myosin
- A thick protein filament in a myofibril with globular heads that bind to actin and pull it during muscle contraction.