Explain cephalization in nematodes and platyhelminthes, Biology

Assignment Help:

How is the nervous system characterized in beings of the phylum Annelida? How can one compare cephalization in annelids to cephalization in nematodes and platyhelminthes?

Annelids have a nervous system made of two ventral chords and one relatively big nervous cell concentration in its anterior portion resembling a primitive brain.

Nematodes have an anterior neural ring connected to two neural chords, a ventral and a dorsal one, while in planarias (platyhelminthes) there are only two small anterior "cerebral" ganglia from which neural chords split. Cephalization in annelids thus is more outstanding than in nematodes or in flatworms.

 


Related Discussions:- Explain cephalization in nematodes and platyhelminthes

What is the goal of risk assessment, What  is  the  goal  of  risk ass...

What  is  the  goal  of  risk assessment? The goal of risk assessment is to provide risk managers, who might be, for example, government regulatory officials, industry health a

Zoology, what is the term used for study of sponges,protozoa,colentreta,mol...

what is the term used for study of sponges,protozoa,colentreta,molusca,fish,aves,mammal

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

Define some advantages of breast milk for infants, Define some Advantages o...

Define some Advantages of breast milk for Infants? 1) Breast milk is a simple and natural method of feeding. It is hygienic, inexpensive and available at all times at the righ

Locating the problem in diabetes mellitus, Q. Locating the Problem in diabe...

Q. Locating the Problem in diabetes mellitus? After having good rapport with the client and the family; you will try to collect the information about the patient, family and he

Describe promoter motifs commonly associated with eukaryotic, Gene expressi...

Gene expression must begin with the process of transcription a)  Describe the promoter motifs commonly associated with eukaryotic protein-coding genes, and explain their influen

Phylum protozoa, What is the classification of this phylum

What is the classification of this phylum

Which part of the cell have an excess of negative charge, Given how the Na+...

Given how the Na+/K+ pump works, which part of the cell (inside or outside) will have an excess of negative charge?

T or F, The role of ATP hydrolysis in actin polymerization is similar to th...

The role of ATP hydrolysis in actin polymerization is similar to the role of GTP hydrolysis in tubulin polymerization: both serve to weaken the bounds in the polymer and thereby pr

What are the inorganic substances, What are the processes that autotrophic ...

What are the processes that autotrophic beings use to produce organic material from inorganic substances? Autotrophic beings make organic material by photosynthesis or by chemo

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