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

Explain saquinavir, Explain Saquinavir Saquinavir (SQV, Fortovase, Invi...

Explain Saquinavir Saquinavir (SQV, Fortovase, Invirase) - When administered as a single protease inhibitor, a soft-gel preparation (Fortovase) with improved bioavailability an

Define precautions for simple staining of bacterial cultures, Define Precau...

Define Precautions for Simple Staining of Bacterial Cultures? 1. Heat fix all the bacterial smears. 2. Use clean, grease free glass slides. 3. Wash the stained slide gent

What is the function of the secretions of the prostate, What is the functio...

What is the function of the secretions of the prostate, seminal vesicle and bulbourethral glands in reproduction? These secretions with sperm cells from the testicles form the

Pericardiocentesis, Pericardiocentesis It is removal of fluid form the...

Pericardiocentesis It is removal of fluid form the pericardial sac. It is a specialized procedure done n ICU or cardiac cath lab or OT. A 16 or 18 gauge needle is inserted

What is osmotic pressure, Osmotic pressure is the pressure formed in a aque...

Osmotic pressure is the pressure formed in a aqueous solution by a region of lower solute concentration upon a region of superior solute concentration forcing the passage of water

Limerick, how do we write a limerick spell?

how do we write a limerick spell?

Diagnosis and management of cancer lung, Diagnosis Chest X-ray, Sp...

Diagnosis Chest X-ray, Sputum Cytology Test  Fibro Optic Bronchoscopy and Biopsy  In later stage of disease - weight loss, Debility indicating metastasis Staging of

Conventional agro-industrial oilseed cakes, Conventional agro-industrial oi...

Conventional agro-industrial oilseed cakes Groundnut meal: It is readily available protein source byproduct from the extraction of groundnut, which is a popular human food i

Define gas liquid chromatography, Define Gas liquid chromatography? Thi...

Define Gas liquid chromatography? This is used for separating and identifying volatile compounds of fatty acids, hydrocarbons, sterols, amino acids and lipids, even from nanogr

Explain precautions for preparation of bacterial smear, Explain Precautions...

Explain Precautions for Preparation of Bacterial Smear? 1. Plates used should be prepared 24 hours before use to avoid spreading of colonies due to moisture in plates. 2. Sw

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