BIO 2135 Lecture 3: Fish
12 Oct 2017
School
Department
Course
Professor
Document Summary
One set of crest cells sinks into the neural tube (becoming placodes) and drive the development of the brain and it"s three major parts. Mid brain = vision system, hind brain= balance or sensing vibration, front brain= sense of smell. Brain is encased in a cranium (brain case) The openings are subject to forces of compression in water. Feed on decaying bodies of big animals that sink to the bottom of the ocean. They burrow into the soft tissue making their way through the digestive tract and eat their way back out. Don"t have eyes because they do not need them that deep down in the ocean. Slime sacs produce slime as soon as it encounters anything adverse around it to cover it"s body in slime (it"s a defensive mechanism) Slime is secreted and the predator can"t grip it so it gets away. It pushes the noted part up against the hand and in combination with the slime your.
