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

Areas affected in peptic ulcer, Q. Areas affected in peptic ulcer? The ...

Q. Areas affected in peptic ulcer? The areas affected in peptic ulcer (due to erosion) can be: 1. Lower part of the oesophagus. 2, stomach (lesser curvature - an urn, whe

Increase in the divcat conductance of neuron b, Consider Neuron B in the fr...

Consider Neuron B in the frog central nervous system whose plasma membrane has a previously unknown channel that is selectively conductive to a newly discovered divalent cation nam

Botany, tell me best topic related to botany

tell me best topic related to botany

Function of promoter in transcription, Problem 1: How many different ty...

Problem 1: How many different types of RNAs are present? What is the function of Promoter in Transcription? Mention different types of RNAs Discuss function of Promot

What is the industrial melanism in evolution, What is the Industrial Melani...

What is the Industrial Melanism in evolution? A classic example of Darwin's theory at work in an actual real-life situation lies in the case of the peppered moth during the ind

Significant for chromosomes, Q. Why is it significant for chromosomes to be...

Q. Why is it significant for chromosomes to be condensed during mitosis and decondensed during interphase? During mitosis the major problem to be solved is the correct separati

Zoonoses disease-zoonotic paramyxoviruses, Zoonotic paramyxoviruses Three ...

Zoonotic paramyxoviruses Three zoonotic paramyxoviruses (Hendra, Menangle, and Nipah viruses) emerged during 1994-2004 and all these viruses have a fruit bat reservoir. Humans are

Describe aerobic respiration to the pyruvic acid molecules, Q. What happens...

Q. What happens during aerobic respiration to the pyruvic acid molecules made by glycolysis? and What is the sequence of reactions that then follows? The pyruvic acid molecules

What are the respective constituents of the gray matter, What are the respe...

What are the respective constituents of the gray matter and of the white matter of the spinal cord? The gray matter, or gray substance, of the spinal cord having predominantly

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