BIOL 2001 Lecture Notes - Lecture 3: Eumetazoa, Cytoplasmic Streaming, Pinocytosis
12 Nov 2018
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3-radial symmetry: animal is divided equally by more than two planes passing through the longitudinal axis. 4-bilateral symmetry: body parts arranged around a single axis, anterior to posterior. The main body cavity in most animals and is positioned inside the body to surround and contain the digestive tract and other organs. 1-acoelomate (no true coelom): region between ectoderm and gut"s endoderm (inner-lining) is occupied only by parenchyma (mesoderm). 2-pseudocoelomate: have a tube within a tube arrangement. No mesodermal smooth tissue membrane (pertioneum) lining the coelom. 3-coelomate: true coelom lined with peritoneum derived from mesoderm. 1-ciliary locomotion (fastest): with hair-like outgrowths from the cell surface called cilia. It includes power strokes (cilia propel water) and recovery strokes (cilia bend toward the cell). 2-flagellar locomotion: with whip-like outgrowths from cell surface called. It is powered by cytoplasmic streaming inside the pseudopod. Folding and unfolding of actin laments drives movement of the pseudopod forward. 2-heterotrophs: include: 2-1-phagotrophs: use phagocytosis to consume large particles.
