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

Describe about the extra-ocular muscles, Describe about the extra-ocular mu...

Describe about the extra-ocular muscles The eye is comprised of extra-ocular and intra-ocular muscles. The extra-ocular muscles are comprised of 4 recti and 2 obliques. The rec

Collibacillosis, C o l l i ba c i ll o si s It is commonly s...

C o l l i ba c i ll o si s It is commonly seen in newly born farm animals and occurs in septicaemic and enteric collibacillosis forms. E tiology: The disea

Filaments of a sarcomere in a skeletal muscle is decreasing, When the overl...

When the overlap between the thin and thick filaments of a sarcomere in a skeletal muscle is decreasing, the A. total length of the I band minus the length of the H zone is dec

Nutritional needs and recommended allowances for proteins, Define Nutrition...

Define Nutritional Requirements and Recommended Allowances for Proteins and Amino Acids? The FAO/WHO Committee (1973) expressed the protein requirements in terms of egg or milk

What is Non chordates?, what are the general characters of nonchordates, ex...

what are the general characters of nonchordates, explain

Explain the term ferns, Explain the term Ferns? Ferns are plants that...

Explain the term Ferns? Ferns are plants that have vessels that conduct water, minerals, and nutrients, and reproduce through spores, rather than seeds. Ferns are therefore o

Define beneficial effects of functional foods, Define beneficial effects of...

Define beneficial effects of functional foods? Several beneficial effects of functional foods have been reported, which include effects such as antioxidant, anticarcinogenic, b

Paratyphoid and other salmonella infections, P a r a typhoid and other ...

P a r a typhoid and other Salmonella infections Paratyphoid salmonellae are non-host-specific. The commonly reported species are S. Typhimurium, S . Enteritidis S . T

Explain vulvovaginal candidiasis, Vulvovaginal candidiasis  Vulvovagina...

Vulvovaginal candidiasis  Vulvovaginal candidiasis is not sexually transmitted, but is often found incidentally in women with STIs. Many remedies are available for vulvovaginal

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