![]() ![]() There, cells in the gastroderm digest the food. After capture, food is moved into the body cavity. Then, carbon dioxide is expelled into the surrounding water.ĭigestion and Excretion: Cnidarians may feed by predation. Instead, epidermis and gastrodermis cells absorb oxygen from the water. Respiration: Cnidarians do not have a respiratory system. The tentacles then pull the prey into the gastrovascular cavity. The barb then releases an immobilizing toxin. When stimulated, the cnidocytes will shoot out a barb that will stick in its prey. These are stinging cells used for capturing food. Cnidocytes are special cells located in the tentacles. ![]() Tentacles: A ring of tentacles surround the mouth of the hydra. The cavity is where digestion takes place. A mouth is located at the top of the cavity. Finally, the inner digestive layer of cells is the gastrodermis.īody Cavity: A gastrovascular cavity is surrounded by these cell layers. The epidermis is an outer protective layer of cells. Ĭell Layers: Cnidarians have two cell layers. An illustration of the anatomy of a hydra (© Depositphotos). ![]() When they act together they perform a special function. Tissues are a group of similar cells that act together. As a result, they lack respiratory and other systems. Coral reefs are important habitats for many different types of ocean life.More Advanced Phylum Cnidaria Facts Phylum Cnidaria Traits Multicellular OrganismsĬnidarians are multicellular. Over long periods of time, their skeletons build on each other to produce large structures known as coral reefs. Their skeletons are made up of calcium carbonate, which is also known as limestone. The corals are sessile (non-moving) polyps that can use their tentacles to feed on ocean creatures that pass by. They are built from cnidarians called corals. Coral reefs (Figure below) look like big rocks, but they are actually alive. ![]() \): The Portuguese Man o' War can deliver nasty stings with its tentacles. ![]()
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