How is the nervous system characterized, Biology

Assignment Help:

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

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 dorsal one and a ventral, 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 flatworms or in nematodes.


Related Discussions:- How is the nervous system characterized

Biodeterioration, is paper broken down by microorganisms

is paper broken down by microorganisms

Water pollutants - water pollution, Water Pollutants - Water Pollution ...

Water Pollutants - Water Pollution Water pollution can occur on account of any one or more of the following agents: 1. Biological: Pathogens such as virus, bacteria,

Human eye, Difference between rod and cone cells

Difference between rod and cone cells

Cardiovascular endurance component for physical fitness, Define Cardiovascu...

Define Cardiovascular endurance Component for physical fitness? In our previous section on work capacity, concepts of aerobic capacity Vo2 max were described. Cardiovascular en

Excitation of heart - circulation, Excitation of Heart - Circulation T...

Excitation of Heart - Circulation The heart has an inherent capacity to contract rhythmically without any external stimulus. Proof of this is obtained when we see that the hea

What is chromatography, Question 1 What is chromatography? List various me...

Question 1 What is chromatography? List various methods of chromatography. Add a note on applications of chromatography in diagnosis Question 2 Discuss the applications of co

Noteworthy features of the nervous system of arthropods, Q. What are the no...

Q. What are the noteworthy features of the nervous system of arthropods? In arthropods the nervous system has more sophisticated sensory receptors with well-advanced cephalizat

Types of cambium, Types of Cambium On the basis of the arrangement of ...

Types of Cambium On the basis of the arrangement of the Fusiform cells as seen in tangential section, cambium is divided into: A) Storied/Stratified Cambium : The groups o

How hiv infection works, How do antibody-based tests detect how HIV infecti...

How do antibody-based tests detect how HIV infection works? After the infection by the HIV the immune system starts the production of antibodies (primary immune response) again

Explain adverse effects of efavirenz, Adverse effects of Efavirenz The ...

Adverse effects of Efavirenz The most common adverse effects have been rash, dizziness, headache, insomnia and inability to concentrate. Vivid dreams, nightmares and hallucinat

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