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Birds-3 - resistance The flight feathers overlap in a way...

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Birds - Structure and Function 3 5 Whole body lifted 4 Upthrust transmitted from wing to coracoid 3 Air resistance gives upthrust on wing 2 Wing pulled down 1 Major pectoral muscle contracts tendon of minor pectoral muscle coracoid minor pectoral muscle (raises wing) major pectoral muscle (depresses wing) sternum keel Front view of skeleton and wing muscles to explain flapping flight 1 2 3 4 Flapping flight 1, 2 and 3. Down stroke. Wing pulled down. Air resistance gives uplift. 4. Upstroke. Flexed wrist reduces air
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Unformatted text preview: resistance . The flight feathers overlap in a way that lets air pass between them during the upstroke, so reducing air resistance. During the downstroke the gap is closed so offering maximum air resistance and giving lift. air passes between vanes air resistance closes vanes Gliding flight. The wings are outstretched. Lift is provided either by upcurrents of air (e.g. thermals) or by slowly losing height. Gliding flight © D.G. Mackean...
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