BIOL 2001 Lecture Notes - Lecture 7: Symmetry In Biology, Radula, Cephalopod
12 Nov 2018
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1-mantle: a specialized tissue formed from the dorsal epithelium that secretes a shell or multiple shells. 2-radula: structure of tiny teeth used for scraping food particles off a surface and drawing them into the mouth. 3-foot: a ventral structure used for attachment or locomotion. 4-ctenidia (gills): specialized respiratory organ or gill which is found in many mollusks. Ctenidia are ciliated in most groups with cilia drive water. Cone snails use their modi ed radula to inject venom (i. e. nirvana cabal containing insulin) into their prey. Air or water (carrying gases) moves through specialized gas-exchange organs. O2 and co2 diffuse between air/water and blood at the respiratory surface. Transport of gases to and from the respiratory surface and body cells. O2 and co2 diffuse between blood and cells; atp is produced. Time required for diffusion increases with the distance of diffusion. A process that allows for transport of substances faster than would be possible by diffusion alone.
