Is it true starfish dont have blood , then how they live
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Is it true starfish dont have blood , then how they live

[From: ] [author: ] [Date: 12-06-25] [Hit: ]
then comes the ring canal,radial canal along arms and then ammpula podium that is tube feet.this water vascular system not only help in circulation but also respiration,locomotion etc.. possessing this water vascular system is the characteristic of phylum echinodermata to which starfish also belong.......
Yes Starfish dont have blood They rely on seawater to pump up their legs.

http://www.orma.com/sea-life/starfish-fa…

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the function of blood is to provide a system of gaseous exchange.since in starfishes this job is done by water vascular system so they do not need and can survive without blood.water vascular system consist of a madreporic canal on aboral end of body.then comes the ring canal,radial canal along arms and then ammpula podium that is tube feet.this water vascular system not only help in circulation but also respiration,locomotion etc.. possessing this water vascular system is the characteristic of phylum echinodermata to which starfish also belong.
beside all this starfish also have a primitive kind of Hemal and perihemal peripheral blood circulation.that is how they survive.

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Body Structure
Starfish aren't actually fish; fish are equipped with gills, fins and backbones. Starfish are echinoderms, invertebrates with radial symmetrical bodies. Rather than scales, most species of starfish have a tough, leathery skin, which offers protection from predators such as fish and birds. This skin is composed of calcium carbonate.

Arms
Most species of starfish have five arms that extend from a central point; however, there are some exceptions. For example, the Coscinasterias calamaria can grow 11 arms, while Sunflower stars can grow up to 24 arms. The arms contain eyespots, which are light sensitive organs that aid in motion detection. Starfish can regenerate lost or injured arms over time. According to National Geographic, some species store vital organs in their arms, so separated limbs can regenerate into new starfish.

Organs and Diet
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******Starfish don't have blood. Instead,****** filtered seawater plays the role of blood. Starfish also lack brain, but they have multiple stomachs. The cardiac stomach allows a starfish to consume prey, while a pyloric stomach completes the task of digestion. Starfish prey on clams, oysters, snails, barnacles and small fish. When consuming shelled creatures, starfish must first use their suction cups to create an opening before using their cardiac stomach.

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If you are going to ask questions then you should make sure that your English is decipherable.

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