circulation patterns, Biology

Assignment Help:

Circulation Patterns

All vertebrates have some similarities in their circulatory systems but as vertebrate life changes from aquatic to terrestrial, the pattern of circulation becomes more complex. Fish and mammals represent two extremes in vertebrate circulation and Fig. 3.6 compares the two. The principal difference is in heart structure, from two chambered in fish to four chambered in mammals. The fish heart contains two main chambers in series the atrium or auricle and the ventricle. There are two subsidiary chambers (not shown in Figure) the sinus venosus which proceeds the atrium and conus arteriosis which comes after the heart.

These contain valves that prevent backwards flow of blood. Blood makes a single circuit from the heart to the gills where it is' oxygenated and then to the dorsal aorta to be distributed to the body from where it returns to the heart by the veins. Such a system has the advantage that all of the blood going to the body has already been oxygenated in the gills. However, there is a disadvantage i.e. the narrow gill capillaries slow down the blood flow resulting in a low blood pressure. This slows the rate of oxygen delivery to the cells and limits the metabolic rate that fish can attain.

1674_Circulation Patterns.png

                              Figure:  Circulatory system pattern in (a) fish and (b) mammals. Rust shows oxygenated blood


Related Discussions:- circulation patterns

The various types of techniques used in forensic, Discuss the various types...

Discuss the various types of techniques used in forensic biology past and present.

New Technology, What is the best microscope to get a detailed view of the p...

What is the best microscope to get a detailed view of the parts inside of a preserved plant cell

Explain transport and utilization of vitamin a, Explain Transport and Utili...

Explain Transport and Utilization of Vitamin A? The efficacy of the intestines to facilitate absorption and utilization of retinoid s and carotenoids depends upon the cellular

How phytohormones help development of parthenocarpic fruits, How phytohormo...

How phytohormones help the development of parthenocarpic fruits? The Parthenocarpic fruits are those produced with no fecundation. Several plants naturally make parthenocarpic

Influence of yolk on cleavage, Influence of Yolk on Cleavage Though b...

Influence of Yolk on Cleavage Though biological significance of yolk is to provide nourishment to the developing embryo, it is not part of the active cytoplasm. Yolk is dead

What are all possibilities of genotypes and phenotypes, What are all possib...

What are all possibilities of genotypes and phenotypes formed in the combination of alleles responsible for the production of factor VIII? Considering the alleles X and Xh, whe

Explain the main benefits of canned foods, Explain the Main Benefits of Can...

Explain the Main Benefits of Canned Foods? The main benefits of canned foods are: (a) They are safe and hygienic and have logically good nutritional value; (b) They are e

Why low ca++ in the body fluid cause in body, Low Ca ++ in the body fluid ...

Low Ca ++ in the body fluid may be the cause of: 1.  Tetany 2. Anaemia 3. Angina pectoris 4. Gout  Tetany cause low ca ++

What is the energy efficiency of photosynthesis, What is the energy efficie...

What is the energy efficiency of photosynthesis? a) What area is occupied by each molecule? b) Calculate the molecular absorption cross section in units of A 2   A cr

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