BIO 101 Lecture 23: Chapter 23- Animal Diversity I- Intervertebrates
Document Summary
Animal characteristics: multicellularity, cells lack a cell wall, obtain energy consuming other organisms, reproduce sexually (most, motile at some point in the life cycle, respond rapidly to external stimuli ie. touch, sound, plants have a slow response. Tissues: groups of similar cells that carry out a specific function ie. muscle. True coelom body cavity: the body cavity is completely lined with tissue derived from mesoderm (annelids, chordates) False or pseudocoelom: the body cavity is partially, but not completely lined with tissue derived from mesoderm (roundworms) No coelom or acoelomate: these is no cavity between the body wall and digestive tract. Protostome embryological development: the body cavity forms within the space between the body wall, and the digestive cavity ie. nematodes, arthropods, annelids, and mollusks first opening of embryological development becomes the mouth. Deuterostome embryological development: the body cavity forms as an outgrowth of the digestive cavity ie. echinoderms and chordates second opening of embryological development becomes the mouth.
