BIO202H5 Lecture Notes - Gastrovascular Cavity, Flatworm, Gastrolith
Document Summary
Reynolds no = size x velocity x density viscosity. Small reynolds no: fluid flow dominated by viscosity (flow is laminar/smooth) Large reynolds no: fluid flow influenced by inertial forces (flow is turbulent) Suction feeding in fish: move jaws rapidly to create negative pressure (sit and wait approach); lower jaw protrusion. Class 3 lever force and resistance on same side relative to fulcrum little angle flexibility. Class 1 lever force and resistance on opposite sides relative to fulcrum temporal-mandibular point of rotation. Superatemporal bone is flexibile and allows jaw to be opened at 120 degree angle. Round worms: mouth, esophagus, crop, intestine, gizzard, anus. Diagram of flat worm: ocelli, pharynx, mouth, branching gastrovascular cavity. Diagram of round worm: anus, mouth, esophagus, crop, gizzard, intestine, typhlosoles (increase digestive area of intestine) digestive cavity. Insects: esophagus, stomach muscular (rugae and sphincters) and chemical (hcl, pepsin), mouth pharynx esophagus crop gizzard intestine anus in that order. Gizzard: muscular grinding (with the help of gastroliths)
