BIO 2135 Lecture Notes - Lecture 9: Oviduct, Osmoregulation, Sister Group
10 Mar 2016
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Document Summary
By becoming small, the animals became simpliied - surface to volume raio increases and difusion can be used for many processes. o. Miniaturizaion and simpliicaion of the body plan is a very common strategy to live in microhabitats o o. Coelomic spaces inside the mesoderm: end up with a body cavity surrounded with mesoderm. Pouches that come of the gut - enterocoely. Coelomic space ills itself in (latworm advantage for feeding) - acoelomate. Eucoelomates that are reduced to narrow spaces surrounding issues - pseudocoelomates o o. Moulted protein cuicle reinforced with alpha chiin or collagen o. Outer cuicle that surrounds body and is solid. To grow in size, they need to shed the cuicle, grow, and build a new cuicle. Cuicle is reinforced with collagen or alpha chiin. Outer epidermis is no longer exposed to the outside so no cilia. Replace the coelom with a hemocoel (new body cavity - a blood cavity)
