BIOL 121 Lecture Notes - Lecture 24: Pylorus, Coelom, Chemotroph

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

Document Summary

Friends: urchins sea cucumbers sand dollars brittle stars. Water vascular system thought to be extension of coelomic cavity to form a network of canals from which extend tube feet (for motion, sensing, respiration & manipulating prey) and branchiae (for respiration) Madreporite pressure valve keeps pressure within the water vascular system consistent. Eye spots light sensitive, red-eye spot at end of each arm. 2 stomachs: one is the delicate pyloric stomach which is attached to intestinal glands in arms; other is the muscular cardiac stomach, can evert stomach into/onto prey. Motile water vascular system with tube feet.