Metameric segment - segmentation, Biology

Assignment Help:

Metameric segment - Segmentation

On the other hand true metameric segment as best observed in annelids has separate schizocoelic body cavity of mesodermal origin in each segment. Individual segments are budded off in linear sequence from a proliferation region just in front of the posterior end. Segmented animals have a specialized anterior acron (prostomium) and posterior pygidium or telson both of which are not segments. In between there are a varying number of segments.

In near perfect segmentation, appendages, musculature, ganglion, nerves, blood vessels, coelom and all body organs are replicated in each segment. This arrangement is best seen in annelids. In chordates, segmentation is usually apparent in the axial skeleton. Muscles and nerves. Why did segmentation evolve in animal groups? What advantages does it confer on the animals in which it is seen? Let us examine this a little closely. The most important advantage is that segmentation divides a body into a series of compartments, each of which can be regulated almost independently. This in a way provided the framework for specialization. In colonial animals this specialization is seen in polymorphism of zooids while in segmented animals regional specialization of segments occurs.


Related Discussions:- Metameric segment - segmentation

Define a protein amino acid sequence, Protein structure is determined solel...

Protein structure is determined solely by a protein amino acid sequence. Should a genetically engineered protein in which the order of all amino acids is reversed therefore have th

Define Listeriosis monocytogenes, Define Listeriosis monocytogenes L. ...

Define Listeriosis monocytogenes L. monocytogenes can grow over the temperature range of about 1 0 to 45 0 C and the pH range 4.1 to around 9.6, it maybe expected to survive

Mutation rates, Each gene has a characteristic mutation rate. Mutation rate...

Each gene has a characteristic mutation rate. Mutation rates are often described as an average per gene basis. For instance, Drosophila has one detectable mutation per 10,000 loci,

Dietary recommendations during diarrhoea, Q. Dietary Recommendations during...

Q. Dietary Recommendations during Diarrhoea? The diet should take into account the normal RDI and various adjustments made to the quantity and quality of the foods to be given.

Adrenaline and noradrenaline, Both these neurotransmitter strengthen memory...

Both these neurotransmitter strengthen memory when they are released into the blood stream following learning. Stressful events stimulate release of stress hormones from the adrena

Explain in brief about the cell membrane, Explain in brief about the Cell M...

Explain in brief about the Cell Membrane All cells, whether prokaryotic or eukaryotic, are bound by a limiting membrane called the cell membrane or the plasma membrane. The ce

Classification of diabetes mellitus, Classification of Diabetes Mellitus ...

Classification of Diabetes Mellitus a) Type1Diabetes Mellitus i) Type 1 a ii) Type 1 b b) Type 2 Diabetes Mellitus c) Others i) Gestational Diabetes Mellitus

Blood, How the blood is circulated with the help of Heart?

How the blood is circulated with the help of Heart?

Describe in detail about the unicellular eukaryotes, Describe in detail abo...

Describe in detail about the unicellular eukaryotes Animal cel1.s and many types of unicellular eukaryotes contain centrioles, which are cylindrical in structure, about 0.15 m

Does the dna replication occur in the cell division, Q. Does the DNA replic...

Q. Does the DNA replication occur in the cell division? Yes. The DNA replication occurs in mitosis as well in the meiosis.

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