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Unformatted text preview: these muscles slightly flatten the thorax and flip the wing up these muscles deepen the thorax and flip the wing down Indirect flight muscles These act on the thorax and distort it, so flipping the wings up and down. This produces a rapid wing beat. There are also muscles which adjust the angle of the wings The wings generate lift. On the downbeat they are held more or less horizontally for maximum effect on the air. On the upbeat they rotate to a vertical angle which offers little air resistance. The downbeat therefore generates lift. 1 and 2 = downbeat 4 and 5 = upbeat D.G. Mackean After Magnan...
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This note was uploaded on 11/29/2011 for the course BIO 218 taught by Professor Young during the Fall '11 term at BYU.
- Fall '11