Protonephridia and metanephridia, Biology

Protonephridia and Metanephridia

Nephridia take place in two major forms - the protonephridium and metanephridium. Protonephridia are found in flat worms. The protonephridial canals end blindly in structures called flame cells or solenocytes internally. Flame cells comprise central cavities that are continuous with the cavities of tubules and consist of a bunch of cilia - the flame. Actually, the flame cell interdigitates along with the first cell of the tubule, by means of finger shaped processes. In solenocytes, the cell lumen is prolonged into a delicate tube and the flame is reduced to a single flagellum. Flat worms usually have a pair of protonephridia. The protonephridial canals are much branched bearing flame ceIls at the end of branches. The flame cells are found scattered during the parenchyma. The flame cells do the filtration; the filtered fluid is propelled by flagella. The nephridiaI epithelium performs the functions of reabsorption and secretion. These physiological mechanisms are comparable with those performed by a vertebrate kidney.

Posted Date: 2/4/2013 4:12:20 AM | Location : United States







Related Discussions:- Protonephridia and metanephridia, Assignment Help, Ask Question on Protonephridia and metanephridia, Get Answer, Expert's Help, Protonephridia and metanephridia Discussions

Write discussion on Protonephridia and metanephridia
Your posts are moderated
Related Questions
Preputial prolapse This deformity is seen in some of the tropical zebu breeds but is not uncommon in European breeds. Initially, it begins as a temperory eversion of a small p

Antibody Structure: An antibody molecule consist of two alike light chains ( 220  amino acids each) ad two similar heavy chains (about  440-450  amino acids each) held together

. which is the main part of respiratory organ?

CHARACTERISTIC S OF HORMONES - (1)      They are regulatory chemicals that control and coordinate functions of different body organs. (2)      Hormones are formed by ductle

Q. Explain about Low blood sugar? Low blood sugar can also be caused by accidentally taking too much of insulin. When this occurs, more insulin is present in the body than nee

Some hyperthermophilic organisms that grow in highly acidic (pH2) habitats belong to the two groups: 1. Eubacteria and archaea 2. Cyanobacteria and diatoms 3. Protists and

Explain the introduction of history of mart disease? Cardio-vascular diseases (CVD) are the leading causes of death and disability both in the developed and the developing na

describe between native and non-native species from the Otay river valley

What is salmonella typhosn Typhoid is  an enteric fever, which relates  to acute infection of  short duration. It is   caused by bacteria called Salmonella typhosn about which

To which direction does the growth of one side of branch, a stem or root induce the structure to curve? Whenever one side of a branch, stem or root grows more than the other si