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This Concept Map, created with IHMC CmapTools, has information related to: Tutorial 1(b)- Vuma, gaseous exchange ???? gas exchange occur by diffusion, nervous system ???? ladder-type nervous system ; paired ganglia form a brain ; sensory cells are in the body wall, digestive system ???? digestive system with single opening(has mouth but no anus), digestive system ???? digestive system is specialized to include a pharynx, stomach, intestine and accessory glands, flame cells ???? presence of flame cell, Body Cavity ???? Eucoelomate, gaseous exchange ???? gaseous exchange via unelaborated body surface or by gills, Body Cavity ???? Acoelomate, excretory system ???? made up of flame-cell system consists of a series of a interconnecting canals that run the length of body. A flame cell is a bulb-shaped containing a tuft of cilia inside the hollow interior of the bulb : cilia move back n forth, bringing water into canals that empty through pores at the surface., excretory system ???? Excretory system involves nephridia. Coiled nephridia tubes in each segment has two openings : one is ciliated funnel that collects coelomic fluid, and the other is an exit through body wall. Between the two openings, a coiled nephridia tubule removes waste from blood vessel, body structure ???? body dorso-ventrally flattened, flame cells ???? absence of flame cell, nervous system ???? nervous system consists of a dorsal cerebral ganglion connected to a ventral nerve cord, body structure ???? metameric segmented body