Often asked: Why Are Mussels Bilateral But Dont Have Cephalization Yahoo?

Why are mussels not Cephalized?

Instead, they wait for food to come to them. Their body shape lets them get food from any direction. But eventually, some worm-like animals evolved bilateral symmetry [“bye-LAT-eral”]. In contrast, animals with radial symmetry are not cephalized: They have no head, just a mouth in the middle.

Do mussels have bilateral symmetry?

Their body shape lets them collect food from any direction. Eventually, though, a line of worm-like animals evolved bilateral symmetry, with a body bearing two sides – left versus right – that are mirror images of each other. They can forage for food, track live prey, seek better habitat, or search for a mate.

Are all mollusks Cephalized?

Both flatworms and molluscs are triploblastic, bilaterally symmetric, and cephalized. But molluscs have developed a true coelom, an internal body cavity enclosed by mesodermal membranes. The coelom in molluscs, however, is strangely reduced to a small space around the heart, sometimes called a hemocoel.

Why do bivalves lack Cephalization?

Bivalves are a bit of an exception to the cephalization that characterizes most mollusks. Bivalves don’t have a head. They feed by filtering out food from the water in which they live. Tiny particles of food get caught in the gills and cilia near the gills move the particles into the mouth.

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Do mussels have a digestive system?

Internal organ systems include an open circulatory system powered by a heart; a digestive system that consists of mouth, stomach, gut, and anus; a decentralized nervous system that controls movement of the foot and adductor muscles; and reproductive organs that usually occur separately in male and female mussels.

Do mussels have a nervous system?

Supporters of vegan bivalve eating claim mussels and oysters cannot respond to stimuli simply because their reaction to it doesn’t stem from a central nervous system while ignoring the fact that they do have a nervous system.

What kind of symmetry do mussels have?

Bilateral symmetry is a feature of mussel bivalves as well as the mother-of-pearl appearance on the inside of the shell. Taxonomists refer to bivalves as having bilateral symmetry where the shells are mirror opposites of one another.

Does a scallop have bilateral symmetry?

Scallops are common marine bivalves in much of the fossil record and in the modern oceans. Individual bivalve shells, unlike brachiopod shells, are asymmetrical. Scallop shells sometimes approach bilateral symmetry, but the subtriangular, wing-like auricles along the hingeline will still display asymmetry.

What are three examples of bivalves?

Bivalves include clams, scallops, oysters, and mussels.

Do mollusks have guts?

6. Clams (and all mollusks ) have a complete digestive system. It consists of a mouth where food is ingested, a short connecting tube called the esophogus, a stomach which temporarily holds food, and an intestine where food digestion and absorption takes place. Food is distributed to the cells of the body by blood.

Does a sponge have Cephalization?

Sponges have no particular symmetry; they are not radially or bilaterally symmetrical. Cephalization means having a head. Cephalization only occurs in bilaterally symmetrical animals.

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Are all mollusks bilaterally symmetrical?

Mollusks are generally considered a phylum of bilaterally symmetrical animals, although there are also many asymmetrical species.

Why do mussels have an open circulatory system?

Mussels. – Mussels have an open circulatory system meaning that blood is not completely transported within blood vessels. – Tissues in mussels are covered in hemolymph in order for the gas and nutrients exchange. – Oxygenated hemolymph is pumped away from the heart through blood vessels to the bodies organs.

Do bivalves have an open circulatory system?

Bivalves have an open circulatory system that bathes the organs in hemolymph. The heart has three chambers: two auricles receiving blood from the gills, and a single ventricle.

Are mussels filter feeders?

Mussels (including green-lipped mussels ) are filter feeders – they process large volumes of the water they live in to obtain food.

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