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Lecture 44

BIOL 1010 Lecture 44: Lecture 44

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Biological Sciences
BIOL 1010
Emily A.Mc Kinnon

O|82 Bio 1010 Contractile tissues & nerves occur in simplest forms in Cnidarians. Polyp body form (Radial Symmetry) Hydras (found in freshwater/lake) & Sea Anemones have cylindrical body with tentacles projecting from one end. o Mostly sedentary Mouth on top of the body at the hub of radiating tentacles. Coral animals Medusa body form (Radial Symmetry) Marine Jelly (Jelly fish) ----------------------------------------------------- -------------- -------- o Move freely in H20 Shape: Umbrella with fringe tentacles around lower edge. 2- 40cm. Mouth in centre of undersurface. Some pass through both Polyp & Medusa life cycles. Cnidarians are carnivores that use tentacles to capture small animals/protists & push prey into mouths. Mouth leads into multifunctional compartment called Gastrovascular Cavity. (Gaster – belly, Vas – vessel) where food is digested. Mouth is the only opening in the body; it is also the exit for undigested food/wastes. o Fluid in the Gastrovascular cavity circulates/transports nutrients, oxygen, & H20 to internal cells & removes metabolic wastes. Fluid also acts as hydrostatic skeleton, supporting &
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