BIOL 1202 Chapter : Test 4 Notes Part 1 Ch 33 34
Document Summary
Eumetozoa: true multicellular organisms; diploblastic (2 tissue layers) 33. 1 sponges are basal animals with no true tissues. Lack true tissues and organs; has an asymmetrical body: sponges. Suspension filter feeders: filter water passing through their body. Spongocoel cavity aligns choanocyte cells that beat their flagella forcing water out of the osculum. Pores: doughnut shaped cells that span the sponge"s body wall. Choanocytes: line the spongocoel; movement of flagella sets up water flow. 33. 2 cnidarians are of the phylum eumetazoa: cnidarians. Wide range of sessile (attached to a substrate) along with floating forms including jellyfish, corals, and hydras. Simple diploblastic, radial body plan: body plan is a sac with a central gastrovascular cavity, single opening serves both the mouth and anus, mesogla layer between epidermis and endodermis (gastrodermis) gives it the jelly structure. Medusa: form moves freely in water by passive drifting and contractions of the bell. Cnidocytes: unique cells that function in defense and the capture of prey.
