BIO 1130 Lecture Notes - Lecture 32: Stoma, Vascular Bundle, Zygote

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

Document Summary

Continents starting to form very large land masses. Survivors from ordovician reflect today"s organisms. survivors : Start to see things on land (plants and things to feed on land), populating of land is buffering effect on the reflectively of continent mineralisation moving in ocean. These slits are ideal places to develop gas exchange which ultimately become gills, allow them to breath. Have dorsal hollow cord: during embryological development ectoderm cell that make nerve cord bulge up on two sides and make hollow nerve cord. Gill slits: one of the openings in the pharynx through which water passes out of the pharynx. Endostyle:a way to trap food from water while they move endostyle is a longitudinal ciliated groove on the ventral wall of the pharynx which produces mucus to gather food particles. Makes a mucous sheet (covering all the pharyngeal openings) which extends up by little cilia on the gills, mucous isn"t solid, it"s a mesh, basically a sieve.