BIOL 150 Study Guide - Cestoda, Covalent Bond, Sister Group
Document Summary
Animals that live in or on another organism called a host and obtain their nutrients by consuming parts of that organism. Mouthparts which enable them to pierce host"s tissues or suck on body fluids. Complex digestive system (parasites typically do not have digestive tracts; the food goes directly to their gut. If they do have one, it is very simple) H & o are unstable or reactive o. Electronegativity how tightly pulls electrons toward its nucleus. Attraction of h of one h20 molecule to o of another h20 molecule: since water molecules tend to disassociate, pure water will consist of: H20 molecules and h+ and oh- ions. Arthropods lever system opposite muscles generate force transporting through appendages joint-legged. Key characteristic: exoskeleton for legs to work against led to reduction in number of segments per species. Organs many body segments with organs in each. Main feature: rear cavity with gills for respiration. Segmented muscles dorsal only, not entire body wall.
