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

How can proteins be classified, How can proteins be classified? Give suitab...

How can proteins be classified? Give suitable examples. Proteins can be classified based on:  Shape and size: fibrous or globular proteins. Functional properties: I

Explain about the freeze drying Method, Explain about the freeze drying Met...

Explain about the freeze drying Method? The Techniques of freeze-drying have been developed over the past half-century for the purpose of preserving certain biological material

Determine the food source for phosphorus, Determine the Food Source for Pho...

Determine the Food Source for Phosphorus? Phosphorus is widely distributed in food. Food phosphorus is a mixture of both organic and inorganic forms although the relative amoun

Explain the future challenges for neuroscience, Explain the Future challeng...

Explain the Future challenges for Neuroscience? When the analysis of single cells and even networks has progressed very nicely, there still remain many significant questions. A

Define reagents for seliwanoff test, Define Reagents for seliwanoff's tes...

Define Reagents for seliwanoff's test? - Sugar solutions of glucose, fructose, galactose, lactose, maltose, sucrose and starch - Resorcinol in dilute hydrochloric acid (1:

What are the three main parts of a eukaryotic cell, What are the three main...

What are the three main parts of a eukaryotic cell? The eukaryotic cell can be divided into two major portions: the cell membrane that divides the intracellular space from the

Flatworms, What are the adaptions flatworms neeed in order to live in their...

What are the adaptions flatworms neeed in order to live in their environment?

What is the likely function of the snf gene, In yeast, a new mutation calle...

In yeast, a new mutation called suc was recently discovered.  The suc mutant cannot use sucrose as a source of carbon, and will not grow if the culture medium contains only sucrose

Reproduction, am not do erection,am sufferin from epididyme

am not do erection,am sufferin from epididyme

ELECTRON TRANSPORT SYSTEM AND PHOTORESPIRATION, DESCRIBE ELECTRON TRANSPORT...

DESCRIBE ELECTRON TRANSPORT SYSTEM AND PHOTORESPIRATION

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