Digestive system of class asteroidea, Biology

Assignment Help:

Digestive System of Class Asteroidea

Most asteroids are scavengers or carnivores and feed on snails, bivalves, polychaets, other echinoderms, fish, sponges, sea anemones and polyps of hydroids and corals. Some feed on plankton and detritus. The digestive system of sea stars extends between the oral end and aboral disc of the animal. The mouth lies at the centre of a muscular peristomial membrane. The mouth is followed by a short oesophagus that in turn opens into a large stomach. The stomach occupies most of the interior of the disc and is divided by a horizontal constriction into a large oval cardiac stomach and a smaller, flattened pyloric stomach. The walls of gastric stomach are pouched. In each arm a pair of digestive glands or pyloric caeca are present and their ducts open into pyloric stomach. The pyloric stomach leads into a short tubular intestine on the aboral side. The intestine opens to the outside through a minute anus at the centre of the aboral surface of the disc. A number of small outpocketings called rectal caeca arise from the intestine.


Related Discussions:- Digestive system of class asteroidea

Explain the resorbable barriers - root perforation, Explain the Resorbable ...

Explain the Resorbable Barriers - Root Perforation It is successfully control internal bleeding through cronal access It is intended to forced in the bone, not left wi

Explain the use of benzoates acid, Q. Explain the use of Benzoates acid? ...

Q. Explain the use of Benzoates acid? Benzoic acid, sodium benzoate and the parahydroxy esters (parabens) are used as preservatives. Benzoic acid and its sodium salt, sodium be

Ist all of the parts of the generalized cell, The systems of your body are ...

The systems of your body are capable of performing specialized functions that keep you alive and enable you to reproduce. In a very general kind of way, a cell is also capable of p

Explain about the drying - methods of food processing, Explain about the Dr...

Explain about the Drying - methods of food processing? Drying is the oldest and probably the simplest way of preserving food. It is usually accomplished by the removal of water

What are other organs and tissues made from that germ layer, From which ger...

From which germ layer do the epidermis and the nervous system originate? What are other organs and tissues made from that germ layer? Epidermis and nervous system have the simi

Name the group of fungi which belong to fermentation, Truffles, morels and ...

Truffles, morels and the many yeasts that are basic to fermentation processes belong to this group of fungi. These fung are termed as: a) Phycomycetes b) Ascomycetes c)

Requirements of various nutrients in constipation, Q. Requirements of vario...

Q. Requirements of various nutrients in constipation? The requirements of various nutrients are not altered in constipation. It is essentially a normal balanced diet (normal RD

Sheep-pox, Sheep-pox Sheep-pox, a highly contagious disease, causes a m...

Sheep-pox Sheep-pox, a highly contagious disease, causes a mortality of 20 to 50% in animals below the age of 6 months. It also causes damage to the wool and skin in adults. Of

Post operative anticoagulation, Post Operative Anticoagulation :  Thromboe...

Post Operative Anticoagulation :  Thromboembolism remains a serious complication after valve replacement. Lifelong anticoagulation is requised for all patients with a prosthetic v

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd