Lecture_11_24_1_Arthropoda_2

Lecture_11_24_1_Arthropoda_2 - The surface area:volume...

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Unformatted text preview: The surface area:volume ratio problem Surface area = 6 L 2 (increases with L 2 ) Volume = L 3 (increases with L 3 ) L As an arthropod gets large, its volume increases faster than its surface area. Muscle force increases with volume. The strength of a tube (exoskeleton) depends on diameter and wall thickness. For a terrestrial arthropod, it must make a proportionately very thick-walled exoskeleton that gets very heavy. Solution: stay small (at least on land) Why do you think that organisms with endoskeletons (internal skeletons) are less size-restricted than those with exoskeletons? A) Because muscles attach on the outside of exoskeletons, but the inside of endoskeletons B) Because it is impossible to molt a huge exoskeleton C) Because endoskeletons are solid, interior support structures D) None of the above Why do you think that organisms with endoskeletons (internal skeletons) are less size-restricted than those with exoskeletons? A) Because muscles attach on the outside of exoskeletons, but the inside of endoskeletons B) Because it is impossible to molt a huge exoskeleton C) Because endoskeletons are solid, interior support structures D) None of the above Arthropoda and their allies: Crustacea (crabs, shrimp, copepods) Hexapods (insects and relatives) Chelicerata...
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This document was uploaded on 03/07/2010.

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Lecture_11_24_1_Arthropoda_2 - The surface area:volume...

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