Circulatory systems in animals, Biology

Assignment Help:

Circulatory Systems in Animals

In animals that have efficient circulatory systems and readily permeable vascular skins, gas exchange occurs through the integument. Thus we find that animals like earthworms, leeches and many larval fishes are among the many animals that obtain the oxygen they need across their general body surface. Even larger animals such as many amphibians and fish may rely on cutaneous respiration during emergencies or use it as a supplement to the gills or lungs. The ability to respire through the integument developed the most in eels, and amphibians that have moist and highly vascularised skins.

The integumentary contribution to respiration may be as low as 20 per cent in dry-skinned toads to 76 per cent in the urodele Triturus alpestris and over 90 per cent in the giant salamander Cryptobranchus alleganiensis. This aquatic amphibian is the largest animal relying exclusively on integumentary breathing. The adults are 25 to 60 cm in length and may weigh over 1 kg. These animals lack gills and the lungs being unspecialised play little or no part in respiration. Animals that are large and have higher metabolic rates have specialised respiratory organs. These organs have a thin respiratory surface to help in gas exchange.


Related Discussions:- Circulatory systems in animals

Why is there a popping sound when you crack your knuckles, Q. Why is there ...

Q. Why is there a "popping" sound when you crack your knuckles, and is it dangerous to crack them? Some reasons have been given for the characteristic "popping" sound associate

Illustrate the techniques of neurology, Illustrate the techniques of neurol...

Illustrate the techniques of neurology A long-standing technique in neurology has been observed the effects on behaviour of lesions (cutting) or ablation (removal) of nerve tis

Will there be an opportunity to comment, Will there be an opportunity to co...

Will there be an opportunity to comment?  In a supplemental notice accompanying the last rule package, EPA is soliciting additional information and public comment on issues fro

Duck septicemia (duck pasteurellosis/new duck disease), D uck septicemia (...

D uck septicemia (duck pasteurellosis/new duck disease) The disease is caused by Pasteruella anatipestifer (Syn. Riemerella anatipestifer ) that mostly affects growing duck

Transport of substances done across the bryophyte tissues, Q. How is the tr...

Q. How is the transport of substances done across the bryophyte tissues? How is this feature related to the general size of these plants? In bryophytes there are no nutrient-co

Explain emtricitabine, Emtricitabine (FTC, Emtriva) Emtricitabine is th...

Emtricitabine (FTC, Emtriva) Emtricitabine is the 5-fluorinated derivative of lamivudine. It has same safetyand efficacy, and can be given once daily. It is available alone or

Describe the ideal primary stability, Less than ideal Primary Stability ...

Less than ideal Primary Stability Faulty osteotomy (a bigger osteotomy than required for the selected diameter of implant) can result when excessive force is used to disengage

What are the animal pole and the vegetal pole of egg, Q. What are the anima...

Q. What are the animal pole and the vegetal pole of the vertebrate egg? The animal pole of a telolecithal egg is the portion of the egg with little vitellus it is opposite to t

Pathophysiology of chronic wasting disease, Q. Pathophysiology of Chronic w...

Q. Pathophysiology of Chronic wasting disease? We all know that heart attack i.e. myocardial infarction is not the beginning but a last stage representing acute clinical manife

Important causes of degradation of ecosystem, Important Causes of Degradati...

Important Causes of Degradation of Ecosystem The important causes that have lead to the degradation of the ecosystem. Deforestation Overgrazing Agriculture

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