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Organ Bath Experiment

Organ Bath Experiment Video

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Bohadschia argus Anatomy Sea cucumbers are typically 10 to 30 cm 4 to 12 in in length, although the smallest known species are just 3 mm 0.

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The body ranges from almost spherical to worm-like, and lacks the arms found in many other echinoderms, such as starfish. The anterior end of the animal, containing the mouth, corresponds to the oral pole of other echinoderms which, in most Experient, is the undersidewhile the Organ Bath Experiment end, containing the anus, corresponds to the aboral pole. Thus, compared with other echinoderms, sea cucumbers can be said to be lying on their side. It is radially symmetrical along its longitudinal axis, and has weak bilateral symmetry transversely with a dorsal and a ventral surface.

As in other Echinozoansthere are five ambulacra separated by five ambulacral grooves, the interambulacra. The ambulacral grooves bear four rows of tube feet but these are diminished in size or absent in some holothurians, especially on the dorsal surface.

Organ Bath Experiment

The two dorsal ambulacra make up the bivium while the three ventral ones are known as the trivium. These are modified tube feet and may be simple, branched or arborescent. They are known as the introvert and posterior to them there is an internal ring of large calcareous ossicles. Attached to this are five bands of muscle running internally longitudinally along the ambulacra.

There are also circular muscles, contraction of which cause the animal to elongate and the introvert to extend. Anterior to the ossicles lie further muscles, contraction of which cause the introvert to retract.

Organ Bath Experiment

Inside the body wall is the coelom which is divided by three longitudinal mesenteries Organ Bath Experiment surround and support the internal organs. In most sea cucumbers, this is the only substantial part of the skeleton, and it forms the point of attachment for muscles that can retract the tentacles into the body for safety as for the main muscles of the body wall.]

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