Gills - respiratory organs, Biology

Assignment Help:

Gills - Respiratory Organs

Gills are the specialised respiratory organs of several aquatic animals. They are found in mollusis and as well in many crustaceans. Typically gills are filamentous structures richly supplied with blood. The gills found inside the body are considered to as internal gills whereas those found outside the body are referred to like external gills. Both are meant for respiration. In crustaceans, gills are generally related with appendages. Though, they may vary in form, origin and location. In crayfish, lobster, crab etc, the gills are filamentous, outgrowths from specific thoracic appendages, namely of epipodites and are enclosed in a chamber, and covered by carapace. These gills are generally ventilated by the paddle like movements of special appendages like the scaphognathite. Many aquatic insects have gills. These are usually abdominal or caudal and are called tracheal gills. These take place in nymphs of Odonata, Trichoptera and in larvae of some beetles. These gills are supplied with fine tracheae in place of blood capillaries. The tracheal gills of the nymphs of the dragonfly Aeshna lie in the rectum.


Related Discussions:- Gills - respiratory organs

Zoonoses disease-milkers’ nodules, Milkers’ nodules Milkers’ nodules are c...

Milkers’ nodules Milkers’ nodules are caused either by cowpox virus, an orthopoxvirus or pseudocowpox virus, a parapoxvirus. These are relatively benign lesions that occur most co

Explain glycogenolysis, Glycogenolysis Unlike glycogenesis, glycogenoly...

Glycogenolysis Unlike glycogenesis, glycogenolysis is the  breakdown of glycogen. Glycogen is  broken down  in  the  liver and muscle catalysed  by  the  enzyme glycogen phosph

PHYLUM PROTOZOA, STATE THE ECONOMIC AND ECOLOGICAL IMPORTANCE OF ECHINODERM...

STATE THE ECONOMIC AND ECOLOGICAL IMPORTANCE OF ECHINODERMS

Biodiesal, Diesel-like liquid obtained from materials of biological origin ...

Diesel-like liquid obtained from materials of biological origin is called biodiesel. Biodiesel can be obtained (i) either from lipids accumulated plants and algae or (ii) from

Medicines and drugs - impacts on biodiversity, Q. Medicines and Drugs - imp...

Q. Medicines and Drugs - impacts on biodiversity? The World Health Organization (WHO) has listed over 21,000 plant names (including synonyms) that have recorded medical uses ar

Qualitative estimation of protein-amino acid content in food, Define Qualit...

Define Qualitative Estimation of Protein/Amino Acid Content in Foods? The protein and amino acid content of foods helps to interpret nutritional differences among foods in term

Types of lysosomes, TYPE S OF LYSOSOMES (1 )      Primary Lysosomes ...

TYPE S OF LYSOSOMES (1 )      Primary Lysosomes or storage granules or protolysosome - The primary lysosomes are smaller in size, they contain hydrolytic enzyme in the form

Morulation, MORUL A TIO N - 32 celled embryo is solid looks like lit...

MORUL A TIO N - 32 celled embryo is solid looks like little mulberry known as morula. It reaches uterus on fourth day. Still it is covered by fertilization membrane mainl

Components of ecosystem, Components of Ecosystem The components of the ...

Components of Ecosystem The components of the ecosystem can be categorised into abiotic or non-living and biotic or living components; Abiotic components: The important ab

Describe binding of two amino acid for peptide formation, How can the bindi...

How can the binding of two amino acids for the peptide formation be described? A peptide is formed when a carbon from the carboxyl group of one amino acid is linked to the nitr

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