BIOL 112 Chapter Notes - Chapter 16: Malpighian Tubule System, Circulatory System, Extracellular Fluid
Document Summary
Arthropods are important to humans in many respects: ecologically, as recyclers, as pathogens, as pathogen vectors. Consume large amounts and kinds of food. With hemolymph - blood + interstitial fluid. Fluid returned to the heart by muscular contractions and enters the heart through ostia (pores) Complete digestive system - foregut, midgut, and hindgut. Malpighian tubules (osmoregulation) - extract waste and uric acid form hemocoel and release it into the cloaca (passageway for fecal, urinary and reproductive discharge) For gas exchange - aquatic species with gills, terrestrial arthropods with tracheal system and some with book lungs (increase surface area) Incomplete metamorphosis - young ones look similar to the adult v. complete metamorphosis - larval stage looks entirely different from the adult stage which is specialized for dispersal and reproduction. Usually divided into plates over the body and cylinders. Limits how they grow, must grow in spurts. Must undergo molting because cannot grow once exoskeleton is.
