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

Water - properties and functions, W A TER Occurence Water is ...

W A TER Occurence Water is the most abundant substance, covering 70% of earth's surface. It constitutes 60-90% of living cells.              5-6% in tooth e

Define about aliphatic alcohols - non glyceride fractions, Define about Ali...

Define about Aliphatic alcohols - Non Glyceride Fractions? These are water-insoluble, with their content varying from 0.5-7% of the unsaponifiable matter. Rice bran oil contain

Why two atoms always represent the same element, Two atoms always represent...

Two atoms always represent the same element if they have. A) the same number of particles in the nucleus. B) The same number of electrons. C) The same number of shells. D) The same

Define short- lived climatic stressful conditions, How do organisms like:- ...

How do organisms like:- a) fungi, b) zooplanktons and c) bears overcome the temporary short- lived climatic stressful conditions? Define.

What is the difference between smallpox and measles, Q. What is the differe...

Q. What is the difference between smallpox (variola) and measles? The Smallpox is a viral infection like measles. The Smallpox is transmitted by respiratory secretions, saliva

What are the possible sources of human embryonic stem cells, What are the p...

What are the possible sources of human embryonic stem cells? Embryonic stem cells can be derived from individual cells of an early embryo, from blood cells in the umbilical co

Inorganic substances - abiotic components, Inorganic Substances - Abiotic C...

Inorganic Substances - Abiotic Components There are about forty elements that are required in various processes of living organisms. Some of these are macronutrients which the

Transplantation - clonal propagation, Transplantation - Clonal Propagation ...

Transplantation - Clonal Propagation The shoots or plantlets multiplied on a medium containing organic nutrients, show poor photosynthetic capability. Moreover, in these pla

Give name of the cells capable of making gametes, Q. What is the name of th...

Q. What is the name of the cells capable of making gametes? What is the ploidy of these gamete-forming cells? The cells that form gametes are the germ cells as opposed to the s

Circulatory system, Circulatory System Coelenterates and platyhelminth...

Circulatory System Coelenterates and platyhelminths nutrients in sponges, respiratory gases and waste materials can easily diffuse through the intercellular spaces. Though, in

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