BIOL 121 Lecture Notes - Lecture 20: Motility, Coelom, Triploblasty

• School: U of S
• Department: Biology
• Course: BIOL 121
• Professor: Jeff Sereda& Mike Pollock

Document Summary

Molts - sheds cuticle in order to grow (ecdysis) Aquatic low ph environments rotting fruits and vegetables. Whip-like movement used for locomotion and stirring up material to access new food. Muscular pharynx region but no other musculature in digestive tract, uses body motions to aid digestion. Hydrostatic skeleton fluid within pseudocoelom acts as a hydrostatic skeleton. Motile longitudinal muscle on opposite sides of body alternate in their contraction, press against pseudocoelom. Sexual gametic life cycle, mobile sperm transferred directly to female (internal fert. separate sexes. Caenohabolitis elegans tiny saline nematode, used in genetic studies. Ascaris large parasitic, infects digestive tract of pigs and humans.