ZOO 2090 Study Guide - Final Guide: Gill Slit, Urogenital Sinus, Olfactory Bulb
3 Dec 2013
School
Department
Course
Professor
Document Summary
Chordate vs. vertebrate: chordate: notochord, pharynx with slits, endostyle/thyroid, posterior tail, hollow nerve chord, vertebrate: more defined organs/internal structures, head. Enlargement of nerve chord forming brain, protected by cranium (skeletal) Distinct heart, kidneys and liver with gall bladder. Conodont fossil material: teeth like shapes distinguish from rocks. Indicate 4cm long, v-shaped myomeres, large eyes, possible notochord. Chordate features non vertebrate chordates: urochordata (sea squirts) Endostyle produces mucus, traps food particle. Gas exchange across tissues of pharyngeal bars. No discrete organs for excretion wastes empty to atrium and leave through excurrent siphon: cephalochordata (lancelets branchiostoma) Can determine sex through cross section of gonads. Wheel organ bands of cilia line oral hood. Water/food flows through pharynx bars trap food, water through slits. Darkly stained ileocolic ring food is mixed before intestine. Respiration primarily over entire surface of organism. External features and body shape and lifestyle: lamprey distinct notochord. Distinct brain, heart, liver (with gall bladder) and kidney.
