BIO 2135 Lecture 12: February 14, 2017 - Arthropods
14 Feb 2017
School
Department
Course
Professor
Document Summary
Alpha-chitin: chitin that is organized in an antiparallel manner. Basement membrane on which the epidermal cells sit. Procuticle is made of exo, meso, endo = protein matrix is being held together by simple ionic bonds. Epicuticle gland cells from below send stuff up to make it. Trying to grow larger suit of armor. Want to recover all the metabolic effort that went into making a cuticle. Exoskeleton is articulating with itself through the membranous regions. Banded muscle system some shorten and some lengthen the structure. Solid rigid body can"t change shape using longitudinal/circular muscles, etc. With a waterproof surface, chemoreception cannot occur. Cuticle sitting in a socket, something hits hair, hits nerve, causes action potential. Chemoreceptive setal hairs = have a pore at the end of the hair. Each is repeated hundreds of times across the surface. Retinula cells (8) are arranged in a circle, with microvilli extensions, contain.
