BISC 102 Lecture Notes - Lecture 3: Bdelloidea, Cephalization, Multicellular Organism
19 Oct 2015
School
Department
Course
Professor
Document Summary
What makes us different from other species and makes us successful? our brains. Heterotrophs: need to ingest other living bodies to survive. Motility: ability to move. causes other features to develop. Appearance of tissues coincides with the first appearance of body symmetry. Next thing that happened was that bilateral symmetry split into two categories of development (protosome, deutrosome development) Radial symmetry we can recognize two parts: top and bottom. Bilateral symmetry creates two mirror images and we recognize top and bottom (dorsel and ventricle) and right side and left side/ head and tail(anterior and posterior) Bilateral animals will have the distinction based on embryonic tissue layers. Endoderm: line most of the whole organs inside. Ectoderm: line most of the outside of the animal and some of the. Bilateral symmetry: inner parts of the body. Mesoderm: give rise to certain new parts of the animal body (muscles, circulatory system, skeletal system)
