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

Left coronary artery, The left coronary artery arises from the left posteri...

The left coronary artery arises from the left posterior aortic sinus. It runs to the left behind the pulmonary trunk and appears between left auricle and pulmonary trunk. In that p

Amphibians, respiratory system in amphibains

respiratory system in amphibains

Gifted species - biological nitrogen-fixation, Gifted Species - Biological ...

Gifted Species - Biological Nitrogen-Fixation Biological nitrogen fixation remains mainly confined to a few distinct nutritional types of prokaryotes, some of which are free-l

Explain the menopausal symptoms, Explain the Menopausal symptoms Menopa...

Explain the Menopausal symptoms Menopausal symptoms include: (i) hormone-related gynaecological problems that occur around the menopause, and (ii) post-menopausal uterine

What is an illustration of gene control, Q. What is an illustration of gene...

Q. What is an illustration of gene control? An elegant instance of gene control in bacteria is operon system. A cluster of genes which is responsible for synthesizing a particu

State structural abnormality and unique behavioural, State the term - struc...

State the term - structural abnormality and unique behavioural The link between structural abnormality and unique behavioural aberration has become clearer as technological adv

Egg envelopes, Egg Envelopes Like any other cell, all the eggs are co...

Egg Envelopes Like any other cell, all the eggs are covered by the cell membrane or plasmalemma It is with two layers of about 50 A? (unit membrane) separated by a gap of 60

Determine some dietary sources of vitamin c, Determine some Dietary Sources...

Determine some Dietary Sources of Vitamin C? Fruits (particularly citrus fruits), vegetables are the best sources of ascorbic acid. Amla is the richest source of ascorbic acid.

Explain about iceberg phenomenon, Q. Explain about Iceberg Phenomenon? ...

Q. Explain about Iceberg Phenomenon? Phenomenon means a fact or occurrence that appears. Let us see how iceberg phenomenon is applied to Diabetes Mellitus (DM). Cases of dia

Define importance of nutrient and drug interaction, Define Importance of Nu...

Define Importance of Nutrient and Drug Interaction? Certain foods, beverages, alcohol, caffeine, and even cigarettes can interact with medicines. This may make them less effect

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