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 The bristles and acicula are protruded and withdrawn through the activity of the intrinsic muscles.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

Determine the term mentalis, Mentalis The mental tubercles on either si...

Mentalis The mental tubercles on either side of mental protruberance(in midline) gives origin to the mentalis muscle. Above the mentalis origin, the incisivus muscle takes orig

What is hemorrhage, What is Hemorrhage Mild to moderate capillary ooze...

What is Hemorrhage Mild to moderate capillary ooze can readily be controlled by pressure packing. A more severe venous or, in rarer instances, an arterial bleed may require cl

Determine the types of exercises, Determine the Types of Exercises Exer...

Determine the Types of Exercises Exercises are generally grouped  into three types: - Flexibility exercises such as stretching improves the range of motion of muscles and jo

Requirements of various nutrients in constipation, Q. Requirements of vario...

Q. Requirements of various nutrients in constipation? The requirements of various nutrients are not altered in constipation. It is essentially a normal balanced diet (normal RD

How do the sodium and potassium ions maintain the neuron, How do the sodium...

How do the sodium and potassium ions maintain the resting potential of the neuron? The plasma membrane of the neuron when at rest maintains an electric potential difference amo

Do octopus and squids have exoskeleton, Do octopus and squids have exoskele...

Do octopus and squids have exoskeleton? Octopus and squids normally do not produce external shell (some squid species can have an internal shell). One cephalopod group, the nau

Conjugation - patterns of sexual reproduction, Conjugation - Patterns of Se...

Conjugation - Patterns of Sexual Reproduction Conjugation is a temporary union among two individuals of the same species, during which the original macronucleus disintegrates,

Neuropsychological screening of adults, Neuropsychological screening of adu...

Neuropsychological screening of adults Normally, a neuropsychological examination explores in depth an individual's performance in a wide range of functional domains. There are

Explain bleeding on probing, Bleeding on Probing (BOP) BOP when elicite...

Bleeding on Probing (BOP) BOP when elicited (notated in patient record as BOP +) after the insertion of a probe into the sulcus with light pressure i.e. 25 N has been shown to

Heat stroke, H e a t stroke It is also known as sun stroke or hypert...

H e a t stroke It is also known as sun stroke or hyperthermia and results in excessive rise of body temperature and absence of sweating. E t i o l og

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