BIO 5 Lecture Notes - Lecture 9: Cuttlebone, Onychophora, Trichinella
Document Summary
Adaptations for active lifestyle: closed circulatory system, gills ventilated by muscle contraction, beak, well developed sensory and nervous system, arms and tentacles. Have an internal bone: the cuttlebone is used for bioency and structural support. All cephalopods move by jett repulsion and they expand their mantle cavity. Expansion draws water in and draws water out through a small opening to jet away. Sperms are packed and plucked out by the female. Unsanitary things in farming or gardening can be a source of contamination. With the roundworms, they live in the intestine of hosts like humans. You get abdominal pain and intestinal blockage. Hookworms have the ability to penetrate through your skin. Once in, they make their way to the circulatory system and move out from the capillary into the later the intestine: the stage of infection is different. Trichinella is similar but can cause diseases: you get infected by eating bad meat.
