BIOL 110 Lecture Notes - Lecture 24: Water Vascular System, Tube Feet, Tide Pool
Document Summary
Biol 110 - lecture 24 - phylum echinodermata and phylum chordata. Members are called echinoderms and common inhabitants of coastal tide pools. Includes sea lilies, sea stars, and sea cucumbers. Are coelomates since they have a large, fluid-filled cavity lined with mesoderm and typically a complete gut. Many sea stars can turn their stomachs inside out by everting them through their mouths. This allows them to initiate digestion before food even enters their digestive track. Characterized by their endoskeleton which is composed of calcium carbonate plates. Tube feet are sucker-like appendages that allow for locomotion, feeding, gas exchange, and protection. Characterized by having a unique water vascular system. Water vascular system - network of hydraulic canals extending in from the tube feet and around the gut of the organism. Uses hydraulic pressure to manipulate tube feet to allow animal to breathe, feed, and move. Closely related to humans as supported by dna data.
