Coelomoducts in polyplacophora, Biology

Coelomoducts in Polyplacophora

In Polyplacophora the coelomoducts divide in the region of coelomostome and the gonadal cavities become closed off from pericardial coelom. The excretory coelom stay connected with pericardial coelom. In gastropods there is a marked asymmetry in the coelomic complex. The left gonad disappears and the right gonad opens into coelomoducts which has lost its renal function and its connection along with the pericardial coelom. The excretory organ is present only on one side (left kidney) and which is large and thick walled. In prosobranchs, the excretory opening is in the posterior part of mantle cavity and in pulmonates it opens outside the mantle cavity. In lamellibranchs, hence the complications of asymmetry in gastropods do not exist; the genital and renal ducts get separated. In the primitive group protobranchs, the whole coelomoducts has an excretory function. The gametes are discharged into renal organs. In filibranchs the coelomoducts is bent into a "U" shaped structure, the lower limb being glandular and the much more distal upper limb forms a bladder. The connection has shifted to the posterior end of the kidney. In eulamellibranchs, the two organs have developed separate openings. In cephalopods as well the separation of genital and excretory components of the coelomic complex has been acquired. The genital duct comes to run separately from the Reno - pericardial canal and kidney.

Posted Date: 2/4/2013 4:30:56 AM | Location : United States







Related Discussions:- Coelomoducts in polyplacophora, Assignment Help, Ask Question on Coelomoducts in polyplacophora, Get Answer, Expert's Help, Coelomoducts in polyplacophora Discussions

Write discussion on Coelomoducts in polyplacophora
Your posts are moderated
Related Questions
Cost due to Injury to Worker Medical cost - medicine, surgery, hospitalization, extended treatment. Working time lost due to injury or death. Time loss of cowork

In an outline form only, attempt the classification of the phylum arthropoda

What is the Definition of Ecology explain? Scientists use the term ecology to refer to the study of the relationships between organisms, and the relationships between organism

Avian influenza The etiological a gentisa via ninfluenz a type A virus und e r the family Orthomyxoviridae. Avian influenza pandemics in Pakistan, Nepal and Myanamar (1995) and

Hemicryptophytes - Classes of Life Form In this case the perennating buds or organs are situated at the soil surface where they are protected by soil and fallen leaves. These

Composition - Culture Medium A standard plant tissue culture medium (Basal medium) contains all the essential macro elements (Carbon, hydrogen, oxygen nitrogen, phosphorus, su

Q. Spastic and Obstructive constipation? Spastic constipation: It results from excessive tone of the colonic muscle. Obstructive constipation: It occurs usually due to obstr

The nucleus comprise the genetic information of cell. In addition to activities which maintain the cell, nucleus creates copies of itself for new protozoans by either asexual repro

Cellular level - Level of body organization The next higher level of organization is the cellular level. This is really an aggregation of cells that are functionally different

Transport with the Help of Membrane Protein Even though, the lipid bilayers do not permit the entry of polar molecules such as ions, sugars, amino acids, nucleotides and cell