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Glossary AB CD EF GH IJ KL MN OP QR ST UV WX YZ Sarcomere A subunit of a myofibril and the smallest contracting unit of a muscle. Many sarcomeres are joined together to form a myofibril. The number of sarcomeres can be increased over time due to stretching or can be reduced due to muscle atrophy. Each sarcomere is composed of a thick filament (myosin) and a thin filament (actin). |