18. What are sarcomeres?

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Sarcomeres are the units of
the tissue formed of
actin blocks (thin ) and myosin
blocks ( filaments). Several
sarcomeres in linear sequence
a myofibril. Therefore muscle
fiber (cell) many myofibrils made
sacomeres.

The compartments myofibrils are
inserted delimited by an
membrane known as . The
sarcolemma is plasma membrane of
muscle cell.