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 The bristles and acicula are protruded and withdrawn through the activity of the intrinsic muscles.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

What else is carried in the plasma, What else is carried in the plasma? ...

What else is carried in the plasma? In addition to proteins, plasma having salts (ions), glucose, lipids and amino acids, hormones, carbon dioxide and urea

What are some functions of the epithelium, What are some functions of the e...

What are some functions of the epithelium? The epithelial tissues can do covering, impermeability and protection against the environment, for instance, in the skin, resorption

Define mitosis er and nucleolus, During mitosis ER and nucleolus begin to d...

During mitosis ER and nucleolus begin to disappear at: 1.  Late prophase 2. Early metaphase 3. Late metaphase 4. Early prophase Late prophase

Iron deficiency anaemia, Iron Deficiency Anaemia   This is the most com...

Iron Deficiency Anaemia   This is the most common nutritional and haematologic disorder  in infancy and chhildhood in developing countries. It is caused by lack of sufficient i

Subphylum mastigophora, Subphylum Mastigophora One or more flagella p...

Subphylum Mastigophora One or more flagella present in adult stages; autotrophic or heterotrophic nutrition; reproduction usually asexual by fission. Class - Phytomasti

Name a few foods which are best blanched, Name a few foods which are best b...

Name a few foods which are best blanched? Yes, green beans, carrots, okra, turnip and cabbage should always be blanched. On the other hand, blanching is not needed for onions,

Antimicrobial barriers - proliferation of microorganisms, Q. Antimicrobial...

Q. Antimicrobial Barriers -  proliferation of microorganisms? The first barrier is the integument: a physical barrier to protect the food, e.g., the shell on eggs, the skin on

Nutrient budgets - nutrient cycles, Nutrient Budgets - Nutrient Cycles ...

Nutrient Budgets - Nutrient Cycles Nutrients are constantly being added and removed by natural and artificial processes. The measure of the input and outflow of nutrients thro

Temperature - aquatic habitats, Temperature - Aquatic Habitats The wat...

Temperature - Aquatic Habitats The water temperature changes less rapidly than the temperature of air because water has a considerably higher specific heat than air, that is l

Bio-security in relation to diseases, B i o-security in relation to disea...

B i o-security in relation to diseases Bio-security is a strategic and integrated approach encompassing policy and regulatory frameworks to analyze and manage risks in the se

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