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

Carbohydrates, what is the structural formula for Galactose?

what is the structural formula for Galactose?

Scientific methord, how adoctor dicide a sickness of a patiant

how adoctor dicide a sickness of a patiant

Field capacity (fc), Field Capacity (FC) It is the capacity of a field...

Field Capacity (FC) It is the capacity of a field to hold the amount of water against gravitational forces. It is expressed as the percentage of the dry weight of the soil. Fi

What is cell biology, What is cell biology? Cell biology is the ...

What is cell biology? Cell biology is the science of studying how cells function like as their reproduction and metabolism, their internal and external anatomy.

Lymph, why is it known as middle man

why is it known as middle man

Evolution, describe the two scientific models for evolution (gradualism, pu...

describe the two scientific models for evolution (gradualism, punctuated equilibrium)

Fluorosis, Fl u o r osi s Continual ingestion of small amount of f...

Fl u o r osi s Continual ingestion of small amount of fluoride through feed or water leads to fluorosis in animals. The toxic effects are based on amount of fluorine inges

Define the effect of dietary fibre on nutrient absorption, Define the effec...

Define the effect of dietary fibre on Nutrient Absorption? Nutrient Absorption: Inclusion of fibre has been shown to retard the absorption of some nutrients. The inclusion of v

Annelida, what are the unique characteristics of a flatworm

what are the unique characteristics of a flatworm

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