Locomotory structures, Biology

Assignment Help:

Locomotory Structures

Annelids possess three kinds of locomotory structures, namely parapodia, setae and suckers. Parapodia are segmentally arranged, lateral, hollow extensions of the body into that also extends the coelomic cavity. Each parapodium basically consists of two lobes, a dorsal notopodium and a ventral neuropodium and every lobe bears a bundle of bristles or setae supported by an aciculum. Related with each parapodium are dorsal and ventral sets of oblique muscles, and as well the intrinsic protractor and retractor muscles. During movement, two parapodia of a segment remain in opposite phases of motion and so cause a sort of paddling activity by water. The bristles and acicula are protruded and withdrawn through the activity of the intrinsic muscles. Parapodia are the major locomotory organs of polychaetes. In accordance with the different functions which they perform, parapodia exhibit variations of form among different polychaetes.


Related Discussions:- Locomotory structures

Explain the disadvantages of tissue punch, Explain the Disadvantages of tis...

Explain the Disadvantages of tissue punch - There is a loss of keratini-ed tissue and this can lead to a compromised soft tissue barrier in cases where there is deficiency of a

What is difference in electrical charge between two points, The difference ...

The difference in electrical charge between two points: Select one: is called the potential difference between those points. is called the diffusion potential between those p

Patterns & Mechanisms of Evolution, What types of individuals in a populati...

What types of individuals in a population are represented by the two ends of a bell curve?

Exchange in alveoli, Exchange in Alveoli The blood that enters the lun...

Exchange in Alveoli The blood that enters the lungs from the heart has been routed through body tissue where mitochondria1 respiration has depleted its oxygen content. It thus

Show chemical compound responsible for ozone layer depletion, Q. What are t...

Q. What are the main chemical compounds that destroy the ozone layer? The major chemical compounds that destroy the ozone layer are the CFCs, chlorofluorocarbons, or freons, su

Explain procambium in primary growing shoot, Explain Procambium in primary ...

Explain Procambium in primary growth in shoot ? The vascular tissue in the shoot is produced from a primary tissue called the procambium, located in the apical meristem. New vas

Medical management of meningitis , Medical Management Trealment of ch...

Medical Management Trealment of choice is cephalosporin which is given interavenously, alternatively can be given. In case of increased intra cranial pressure mannitol and o

Pathophysiology of bronchial asthma, Pathophysiology Asthma result fro...

Pathophysiology Asthma result from several physiological alterations, including altered immunologic response, increased airways resistance, increased lung-compliance, impaire

Haemocyanin - respiratory pigments, Haemocyanin - Respiratory Pigments ...

Haemocyanin - Respiratory Pigments This pigment is found in several arthropods and molluscs. Haemocyanins do not consist of haee groups. The metal they consist of is copper, w

Explain identifying features of rhizopus - food microbiology, Explain Ident...

Explain Identifying features of Rhizopus? Macroscopically Rhizopus appears as a white cottony mass (look at rhizopus growth on media above) growing rapidly and spread over enti

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