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Arthropod general structure
- -head (feeding,sensing)
- -thorax (locomaotion)
- -abdomen (mating, excretion)
- -exoskeleton (protection, strength, limiting- MUST shed to grow- 1 reason for limited size of insects and other arthropods, helps minimize moisture lost)
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Arthropod head (sensing, feeding structures)
- -compound eyes and simple eyes (just light detection)
- -antennae-sense of touch, smell, chemoreception, temp., humidity
- -mouth parts (review general facts!)
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compound eyes
- -made up of many segements/sections so can sense motion
- -can see color and light
- -have a direct connection to the brain (no optic nerve)
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Arthropod thorax (locomation/transportation)
- -3 segements (pro, meso, metathorax)
- -dorsal section: tergum
- -ventral section: sternum
- -legs on each segment
- -wings on last 2 segements
- -skeletal invaginations for muscle attachment
- -vertical muscle: flexes thorax, raises wings; relaxes and wings lower (w/assistance from other muscles)
- -wings(1st animal to have them)
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1)advantages of wings
2)what are wings
- 1)-enabled birds to disperse to new areas
- -could avoid adverse conditions, predators
- -exploit new areas to lay eggs or mate
- 2)-outgrowth of exoskeleton
- -dead tissue(cannot be replaced)
- -veins(hydrostatic) pump up wing, then dry out (no fluids like human veins)
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