BIOL 312 Lecture Notes - Lecture 11: Circulatory System, Liquid Diet, Hemolymph

• School: University of Victoria
• Department: Biology
• Course: BIOL 312
• Professor: Steve Perlman

Document Summary

Midterm: course spaces words and concepts, current phylogeny. Few mc and a bunch of short answer. People focus too much on memorizing but important to know concepts. Internal anatomy and physiology: 1) muscle and locomotion 2) endocrine system 3) circulatory system: tracheal system 5) digestive and excretory systems 6) reproductive system 7) nervous system and sensory biology. Attachment to exoskeleton for soft-bodied insects, extra support comes from pressing against hemocoel (fluid-filled body cavity). Tracheae (air-filled tubes) enter via spiracles (opening with valves) beware water loss! Used high resolution x-rays: larger beetles have larger tracheae. Aquatic modifications: tracheal systems can be closed (spiracles absent) tracheal: gills, open tracheal (gas bubbles). Gills in aquatic lineages are fundamentally different (nonhomologous): evidence for independent colonization of water. Circulatory system: hemolymph moved through body by muscular pumps (major pump: dorsal vessel. Hemolymph: bathes internal organs, nutrient storage and delivery, removes metabolites, immune response, wound healing, turgor and moulting pressure, wing inflation, thermoregulation.