Starfish Pre-Lab Questions 2026

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Carefully and gently remove the entire pyloric caeca from the dissected ray of the starfish. Locate the gonads under the pyloric caeca. Especially in preserved specimens, it is difficult to recognize the gonads because they are only a slightly different shade of brown and texture compared to the pyloric caeca.
They have no brain or blood Starfish dont actually have a brain, or even blood! In fact, they use filtered sea water to pump nutrients through their nervous system instead.
Why do the gonads sometimes appear larger? When the star fish is mature and ready to reproduce, it appears larger.
What can be concluded from the available data is that starfish possess a sense of touch, some are able to sense gravity and many display positive rheotaxis, moving up currents. A number of starfish species use olfaction during foraging and prey localization.
Lacking a brain, blood and even a central nervous system, it might come as a surprise to you that starfish have eyes. Just to further add to their unusual anatomy, their eyes are on the end of their arms.

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The sunflower sea star is among the largest and fastest sea stars in the world with an impressive 1-meter arm span and 16-24 limbs. With over 15,000 tiny tube feet, its like the speedster of starfish, gobbling up sea urchins, clams, and even other starfish.
Answer and Explanation: Sea stars utilize the suction caps present in their water vascular system for grasping their prey, and the water vascular system also helps the sea stars in breaking open the hard shells of mollusks, which in turn exposes the meat for eating.
Sea stars are ravenous carnivores with a special adaptation for consuming prey outside their bodies. Their stomach can be extended out through their mouth to engulf and digest prey. This feature allows sea stars to consume a variety of prey larger than their mouth.

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