BIO 1130 Lecture Notes - Lecture 1: Tunicate, Lamprey, Axial Skeleton

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

Document Summary

Anthropods: trilobites (some, marine forms (crustacea) What is left is 32(4) of organisms that we see now in modern ages. A very stable time (climatically) on the earth. Great big ocean mass, sitting surrounded by continents: highly productive continental shelf. An ideal condition for leftover organisms to be able to survive. We are a subset of the chordates. Pharyngeal gills: with openings on the side where water flows in and outwards. Endostyle; how we turn those pharyngeal gills into a feeding mechanism to be able to attract and consume food. Notochord: important in how an animal moves. The water does not enter the digestive system ( do not want to dilute it ) Creates a sheet of mucus that slowly rises to the surface of the pharynx ( a mucus lining) Now when the water gets into the pharynx and food particles come in, the bag is constantly being regenerated at the bottom; crunched up.