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

Haemodynamic study of constrictive pericarditis, Q. Haemodynamic Study of c...

Q. Haemodynamic Study of constrictive pericarditis? Simultaneous right and left heart studies are useful. Due to exaggerated waves in atria, W-shaped atrial pressure tracing wi

What are the respective functions of phospholipids, Q. What are the respect...

Q. What are the respective functions of phospholipids, carbohydrates and proteins of the cell membrane? Membrane phospholipids have a structural function they form the bilipid

Determine the structural classification of bone, Structural classification ...

Structural classification of bone Macroscopically, bone tissue can be classified into two types, compact and trabecular bone. Compact bone is dense, corticated and makes up the

Effect of insulin on metabolism of carbohydrate, The foods we take have thr...

The foods we take have three basic ingredients - carbohydrate, protein and fat. Insulin has profound effects on the metabolisms of carbohydrate, protein and fat. Metabolism helps o

Vesicular exanthema, Vesicular exanthema Vesicular exanthema of pigs close...

Vesicular exanthema Vesicular exanthema of pigs closely resembles foot-and-mouth disease in these animals. The virus causing the disease belongs to the genus Calicivirus in the fa

Chloroplasts, Chloroplasts are disk-like organelles with the double membra...

Chloroplasts are disk-like organelles with the double membrane found in the eukaryotic plant cells; contain thylakoids and are the site of photosynthesis. ATP is generated during

What percentage of the individuals are themselves dihybrid, In the offsprin...

In the offspring of a dihybrid self, what percentage of the individuals are themselves dihybrid?

The mitochondria contain their own dna, Why do you think the mitochondria c...

Why do you think the mitochondria contain their own DNA (circular) and have a double membrane?

Nutrition intervention, Nutrition intervention Nutrition intervention, ...

Nutrition intervention Nutrition intervention, the third step of  the nutrition care process, is a specific set of activities and associated materials used  to address the prob

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