BIOL 111 Lecture Notes - Lecture 52: Hemolymph, Arthropod, Trachea

• School: McGill University
• Department: Biology
• Course: BIOL 111
• Professor: Richard Roy

Document Summary

Arthropod circulatory system the circulatory system is open their heart is dorsal and tubular and 1-chambered with holes (ostia: heart drives hemolymph (blood) into hemocoel spaces, one-way valves prevent backflow. Arthropod respiratory system crustaceans have gills insects have holes (spiracles) that open into tubular tracheae, which branch into finer tubes o this carries o2 to the body cells. Biol 111 organismal biology they are secreted by endocrine cells: most hormones are distributed throughout the body by the blood and will bind to target cell receptors in arthropods, two hormones regulate molting: o ptth (brain hormone) Produced in the brain and stored just outside the brain this controls the activity of the prothoracic gland o ecdysone. Produced by the prothoracic gland it is secreted into the blood the target cells are epidermal cells that respond by ecdysis. Body control systems there are two body control systems: o endocrine system.