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3 - -Molting periods when arthropods shed exoskeletons...

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AP Biology Campbell Textbook Notes Arthropods - Segmented body, tough exoskeleton (made of protein and chitin), and jointed appendages (structures extended from body) - Based off of trilobites, but have fewer body segments and more specialized appendages. - Tracheal tubes: extend throughout body providing O2 - Spiracles: small openings along side of body, - Spiders use book lungs: organs that have layers of reparatory tissue stacked like pgs. Of books. - Open circulatory system: heart pumps blood, thru arteries, enters tissues, leaves vessels, moves thru sinuses, collects in a large sinus, enters heart again. - Excretion: Malpighian tubules: saclike organs that extract wastes from blood and add them to feces that moves thru gut. - Response: they contain brain, ganglia, and compound eyes to detect color and motion. - Move thru system of flexing and extending the joint. - Internal and external fertilization
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Unformatted text preview: -Molting: periods when arthropods shed exoskeletons, endocrine system, manufacturers bigger exoskeleton to take its place. Hide during molting.-Crustaceans: crabs, shrimps, lobsters. Two pairs of antennae, chewing mouth parts called mandibles. Have 3 body sections: head , thorax which lies behind head and houses organs, and abdomens. Sometimes head and thorax join to form cephalothorax.-Chelicerates: horseshoe crabs, spiders, ticks . have mouthparts called chelicerae. Four pairs of legs.Two classes: Merostoma (horseshoe crabs) and Arachnida(spiders). Spiders spin webs through spinnerets, organs that contain silk glands.-Uniramians: centipedes, melipedes and insects. Have jaws, one pair of antennae, unbranched appendages. Centipedes: one pair of legs per segment/carnivores. Millipedes: two pairs of legs per segment/detrivores....
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