A starfish has an essentially simple nervous system: it does not have a brain, and it does not even have ganglia that would help it to coordinate its movements. Quizlet flashcards, activities and games help you improve your grades. p35. Starfish lack distinct sense organs and centralized brains, but they have complex nervous systems and respond to light, temperature, touch and water conditions. Ive personally seen a dominican type starfish move a few metres outside of the water, from the sandshore, to the water, and it took "her" much much longer than 10 seconds out from the water. Starfish Point used to be peaceful where you could find starfish easily now its full of boats playing loud music people having bar-b-q's and spilling their alcoholic drinks into the ocean they even have a water slide anchored off shore. Sea stars are eaten by bottom-dwelling fish and crabs, as well as by sea gulls when low tides leave the sea stars exposed. Unable to plan their actions, if starfish detect prey, they instinctively move toward it. The Sunflower sea star (Pycnopodia helianthoides) is the largest: fully grown, its arm-span is about a metre. The figure below (from Brusca and Brusca) is a cut-away view of the digestive system and associated structures. Starfish have a complete digestive system with a mouth at the center of their underside (the "oral" side) and an anus on their upper surface (the "aboral" side). Some live in the intertidal zone, between low and high tide. They have a complex nervous … Starfish Digestion and Circulation. On the other hand, they live in the ocean, so they will never run out of water. Starfish, or sea stars, are Echinoderms of the Class Asteroidea. Biology Quiz: Excretion and Starfish study guide by katy_kessler includes 44 questions covering vocabulary, terms and more. They have five or more arms and can be quite large. I was at the time witnessing the … NO BRAIN : Your primary teacher must have asked you, “Does a starfish have a brain?” The answer is no. “When the sun gets high, they will die, unless I throw them back into the water.” The old man replied, “But there must be tens of thousands of starfish on this beach. The nervous system of a starfish is therefore located in the nerve ring around its mouth, from which a radial nerve branches off and extends to … (By the way, it was not me doing it. A short intestine, rectum and anus are at the top of the disk. Sea stars breed in the spring, producing as many as 2,500,000 eggs. I’m afraid you won’t really be able to make much of a difference.” The boy bent down, picked up yet another starfish and threw it as far as he could into the ocean. Regeneration will occur as long as one fifth of the sea star's body remains intact. All live in the ocean, on the sea floor.Many starfish live in deep water, others in shallow water. The starfish do not have a brain, but they are not fools. If I was a starfish I would leave never to return!