Circulatory systems in animals, Biology

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.

Posted Date: 1/15/2013 6:34:27 AM | Location : United States







Related Discussions:- Circulatory systems in animals, Assignment Help, Ask Question on Circulatory systems in animals, Get Answer, Expert's Help, Circulatory systems in animals Discussions

Write discussion on Circulatory systems in animals
Your posts are moderated
Related Questions
Monosaccharides are frequently known as single or simple sugars and are the easiest of all carbohydrates. That is the building blocks of all higher carbohydrates. The Monosacchari

What is the incubation period of an infection? Incubation period is the time interval among the infection by an agent that causes disease and the first signs or symptoms of th

quality is expensive. discuss

plese help for an assignment of topic parasitic flat worms for a first year zoology student.

What is Double Labelled Water (DLW)? Technique DLW is currently considered the most accurate technique for measuring TEE in free- living individuals. It is the method used to m

The cardiac output is the volume of blood pumped from the heart every minute. It is obtained by the volume pumped with each beat (stroke volume) multiplied by the heart rate. The c

What is pedigree analysis . How to solve the complicated questions of pedigree . How to identify wheather it is dominant or reccessive its genotype

If a solution has a pH of 7.5, what would its new pH be if the concentration of H 3 O ions in the solution were increased by 100 times? Explain your reasoning. As a tenfold inc

The agouti locus in mice has three alleles: A is recessive and confers a black coat, A is dominant to a and confers an agouti coat, and AY is dominant to both and confers a yellow

Q. Concerning their respective intermediate hosts how different are Taenia solium and Taenia saginata? The midway hosts of the Taenia solium are pigs and the intermediate hosts