Muscles contract and relax to allow for locomotion, and they accomplish this with structures called sacromeres. In this fruit fly larva, sacromeres appear as the thin, striped bands within the red muscle tissue along the body wall. Flying insects have sacromeres that are not built for maximum energy output; rather, they are long with a limited range of motion in order to assist in wing movement during flight.
Image by Timothy Mosca, Stanford University.
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Muscles contract and relax to allow for locomotion, and they accomplish this with structures called sacromeres. In this fruit fly larva, sacromeres appear as the thin, striped bands within the red muscle tissue along the body wall. Flying insects have sacromeres that are not built for maximum energy output; rather, they are long with a limited range of motion in order to assist in wing movement during flight.

Image by Timothy Mosca, Stanford University.

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