Ish feed? 4. What system in their body helps them catch & hold their food? 5. What does echinoderm mean in Greek? Why is this a good name for this group? 6. Name 2 classes of echinoderms & a member of each class. 7. Where does water enter a starfish? Where does it leave? Starfish Dissection Questions 1) Label the central disc, arms, and madreporite on Figure 1. The spines protect the starfish and are part of their internal skeleton. Label these on figure 1. Look at the tip of each arm and.
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What system in a starfish body helps them catch and hold food?
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.
What is the most interesting starfish?
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, it's like the speedster of starfish, gobbling up sea urchins, clams, and even other starfish.
What is the most interesting part of a starfish?
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.
What is special about a starfish?
They have no brain or blood Starfish don't actually have a brain, or even blood! In fact, they use filtered sea water to pump nutrients through their nervous system instead.
What special sense does a starfish have?
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.
Why do the gonads appear larger on starfish?
Why do the gonads sometimes appear larger? When the star fish is mature and ready to reproduce, it appears larger.
What must be done to reveal the gonads starfish?
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.
What is unique about the starfish's stomach?
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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