BIO 1130 Midterm: Part A keyowrds paleozoic

• School: University of Ottawa
• Department: Biology
• Course: BIO 1130
• Professor: Jon Houseman

Document Summary

Acoelomate: this organisms have no cavity separating the gut from the muscles of the body, nstaed they just have a solid mass of cells between the gut and the muscles. Annelids: 4 bundles of setae and metamerism of mesodermal structures are unique to these, they are the first to penetrate the sunstrate. , aquiferous system: combines pumping and food capturing choanocytes with a varierty of canals through which water flows, present in sponges, it allows water to be filtered. Assymetric body plan: the lack of symmetry in some organisms, they never produce identical hlaves when cut in any way, eg sponges. Bilateral symmetry: when the body can be divided into 2 identical halves along one plane only, they are characterized by a movement in which only one head of the body leads. Blastopore: an opening in the archenteron which eventually becomes either a mouth or an anus, in protostomes it becomes a mouth in deuterostomes it becomes an anus.