Explain the nervous system characterized in echinoderms, Biology

Assignment Help:

How are the symmetry and the nervous system characterized in echinoderms?

Adult echinoderms, with cnidarians, are the animals that present radial symmetry, i.e., their body structures are dispersed around a center. The radial symmetry in echinoderms though is a secondary radial symmetry, as their larval stage has bilateral symmetry and the radial pattern appears only in adult individuals (there are some few adult echinoderms with lateral symmetry). All other animals have lateral symmetry with exception of poriferans (no symmetry is explained for them).

Echinoderms do not present cephalization and they have a disperse network of nerves and neurons made of a neural ring around the mouth and of radial nerves that ramify to follow the pentaradial structure of the body.

 


Related Discussions:- Explain the nervous system characterized in echinoderms

Human diseases caused by bacteria, Q. What are some human diseases caused b...

Q. What are some human diseases caused by bacteria and what are their respective modes of transmission? The major human bacterial infections transmitted by respiratory secretio

Name the drugs will help relieve for patient x, Patient X has blood plasma ...

Patient X has blood plasma levels of Parathyroid Hormone (PTH) that are always very high due to a tumor consisting of Parathyroid Gland cells that secrete high levels of PTH into t

Reducing cost of accident, Reducing Cost of Accident One clear way to ...

Reducing Cost of Accident One clear way to control the cost of accident would be to follow all the rules of book for safety. All the methods of safety which were described ear

Define the obesity in children, Define the Obesity in Children? It is d...

Define the Obesity in Children? It is difficult to measure overweight or obesity in children and adolescents because they grow and mature at different rates. Weight status in c

Define the term- life on earth, The article entitled "Life on Earth" is try...

The article entitled "Life on Earth" is trying to make the point that RNA likely included before DNA. Forthis article which of the following is false? A. Chains of RNA nucleoti

Cardiac cycle, Cardiac Cycle Cardiac cycle has two phases-systole and...

Cardiac Cycle Cardiac cycle has two phases-systole and diastole. Ventricular systole and diastole occur as a result of depolarization and chamber volume and pressure. The di

Asymptomatic or mildly symptomatic patients, Q. Asymptomatic or Mildly Symp...

Q. Asymptomatic or Mildly Symptomatic Patients? The treatment is controversial. Some give them betablockers/or calcium channel blockers like verapamil, in the hope of preventin

Psychiatric emergencies, Psychiatric Emergmcy: Psychiatric  Emergmcy i...

Psychiatric Emergmcy: Psychiatric  Emergmcy is  the treatment of disorders of mood, thought and behavior in  an emergency  setting. Psychiatric emergencies are conditions in w

Features of gateway vector, Could any of the following features be useful i...

Could any of the following features be useful in a gateway vector; (i) Origin of replication (ii) multiple cloning site (iii) blue/white selection (iv) M13 forward and rev

What is the genetic code, The genetic code is the group of rules by that in...

The genetic code is the group of rules by that information encoded within genetic material DNA or mRNA sequences is changed into proteins (amino acid sequences) by living cells. Th

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