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

How is hiv transmitted, Q. How is HIV transmitted? What is the disease caus...

Q. How is HIV transmitted? What is the disease caused by this virus? The HIV (human immunodeficiency virus) is supposed to be transmitted through blood, semen, vaginal secretio

What is iron overload and toxicity, What is Iron Overload and Toxicity? ...

What is Iron Overload and Toxicity? We have seen that absorption of iron is very effectively regulated. This prevents overload of the tissues with iron from diet/supplements in

Neuron, It arises from a one embryonic cell known as neuroblast Types of...

It arises from a one embryonic cell known as neuroblast Types of neuron:  According to number of process¬ (a) Unipolar: Only axon is there. e.g. mesencephalic nucleus. (b)

Inhibition of microbes by weak acids, With the exception of those soft drin...

With the exception of those soft drinks that contain phosphoric acid, in most other acidic foods acidity is due to the presence of weak organic acids. These do not dissociate comp

Define sugar as a type of carbohydrates, Define Sugar as a type of Carbohyd...

Define Sugar as a type of Carbohydrates? This group includes monosaccharide and disaccharides. List down the names of sugars under both these groups and check it out with those

What are the two groups of defense mechanisms of the body, What are the two...

What are the two groups of defense mechanisms of the body against foreign or harmful agents? What is the difference between them? The body has many defense mechanisms against f

Compound leaf, Compound leaf is the leaf in which the blade forms small le...

Compound leaf is the leaf in which the blade forms small leaflets. Compound leaves which have several small leaflets originating from the central axis are termed as pinnately comp

.ecology, describe between native and non-native species from the Otay rive...

describe between native and non-native species from the Otay river valley

Carbon, I need the parts of the structure carbon. Include elements,monomer...

I need the parts of the structure carbon. Include elements,monomer,polymer, and any sub units

What is molecular formula of the compound, A solid compound was found to co...

A solid compound was found to contain 42.11% C, 51.46%O and 6.43% H by weight. The molecular weight of the compound was 341. What is the molecular formula of the compound?

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