Gaseous exchange, Biology

Assignment Help:

Gaseous Exchange

Gaseous exchange is take place on by both mantle and the gills. The gills of most bivalves are highly changed for filter feeding. They are derived from the primitive ctenidial by lengthening of the filaments on every side of filamentous axis. As the ends of long filaments became folded back towards the central axis; the ctenidial filaments took the shape of a long slender 'W'. The filaments lying beside each other became joined through ciliary junctions or tissue fusions, forming plate like lamellae along with many vertical water tubes inside. Thus water enters the incurrent siphon, propelled by ciliary action, then enters the water tubes by pores between the filaments in the lamellae proceeds dorsally into a common suprabranchial chamber and then out of the ex-current aperture.


Related Discussions:- Gaseous exchange

Explain the management strategies congenital heart disease, Explain the Man...

Explain the Management Strategies for Adults with Congenital Heart Disease ? The goals for management of congenital heal disease in adults are improving upon the natural histo

Explain fungal infections, Fungal Infections Intravenous infusion of am...

Fungal Infections Intravenous infusion of amphotericin B deoxycholate  frequently causes fever and chills, and sometimes headache, nausea, vomiting, hypotension and tachypnea,

Leishmanias – flagellates, Leishmanias – Flagellates Species of the ge...

Leishmanias – Flagellates Species of the genus Leishmania are parasites of mammals including man. Leishmanias infections occur over wide regions of the world from Asia, the ne

Nutritional factor that contribute to the malnutrition - chd, Define Nutrit...

Define Nutritional and metabolic factors that contribute to the malnutrition of CHD? Nutritional and metabolic factors that contribute to the malnutrition of CHD infant are ele

What are the complementary base-pairing rules for biology, What are the com...

What are the complementary base-pairing rules for biology? In DNA, Adenine bonds with Thymine, Cytosine bonds with Guanine. In RNA, Thymine is changed with Uracil (bases capita

Thermal stratification - lake ecosystem, Thermal Stratification - Lake Ecos...

Thermal Stratification - Lake Ecosystem Shallow lakes show no thermal stratification as their waters are well mixed, resulting in uniform temperature throughout. However lakes

Define genetic susceptibility factors for obesity, Define Genetic Susceptib...

Define Genetic Susceptibility Factors for Obesity? Some people inherit a tendency to become fat. Earlier, it was thought that genetic inheritance ranged from 66% to 80% but now

State the testing of ketones in urine, State the Testing of Ketones in Urin...

State the Testing of Ketones in Urine Ketones are also known as ketone bodies. Ketone bodies are catabolic products of free fatty acids and three ketone bodies that can be dete

Tracheal gills - respiration, Tracheal Gills - Respiration In many spe...

Tracheal Gills - Respiration In many species of aquatic insects the air in the trachae is replenished by diffusion of oxygen via tracheal gills. Many aquatic insects carry a t

Explain bruce protocol, Q. Explain Bruce Protocol? Bicycle Ergometry ...

Q. Explain Bruce Protocol? Bicycle Ergometry Most bicycle test are performed sitting upright, but supine bicycle test have become more popular. Treadmill Test The

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