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 radial symmetry in classification animal kingdom, Explain Radial S...

Explain Radial Symmetry in Classification of the Animal Kingdom? All of the animals besides the sponges are considered to belong to the Eumetazoa, or the "true animals" because

Explain the second maturation division of the mammalian ovum, The second ma...

The second maturation division of the mammalian ovum occurs: 1. Shortly after ovulation before the ovum makes entry into the Fallopian tube 2. Until after the ovum has been p

Define body mass index (bmi) or quetelet index, Define Body Mass Index (BMI...

Define Body Mass Index (BMI) or Quetelet Index? BMI is an index measure of body fat used for the assessment of disease risk.  It is a figure which gives an indication of weight

Supply of animals in lab, Supply of Animals: Lab animals must be obtained ...

Supply of Animals: Lab animals must be obtained from accredited dealers and by accredited dealers, we mean suppliers in the business of supplying animals for lab use, and not from

What do protozoans eat, What do protozoans "eat"? Do they move in search fo...

What do protozoans "eat"? Do they move in search for food? Protozoans are heterotroph beings, i.e., they do not make their own food and therefore they require to search for it

Muscular force, 2.?In order to increase muscular force production, muscular...

2.?In order to increase muscular force production, muscular contractions may be modulated in two ways. Explain.

Cells are miniature chemical factory, Cells is a Miniature Chemical Factory...

Cells is a Miniature Chemical Factory Due  to its incessant metabolic processes, a living   cell earns the  attribute  of a  miniature chemical factory   metabolites and  free

How can we examine the chromosomes, Is it more indicated for a geneticist d...

Is it more indicated for a geneticist desiring to map the X chromosome of the mother of a given family (the researcher does not have access to her DNA, only access to the genetic m

Explain non-surgical endodontic retreatment - missed canal, Explain Non-sur...

Explain Non-surgical Endodontic Retreatment - Missed Canal Missed root canal as it hold pulp tissues and bacteria is major cause of endodontic failure. Mandibular molar

Define the root perforation, Define the Root Perforation An endodontic ...

Define the Root Perforation An endodontic perforation is an artificial opening in the tooth or its root, created by clinician during entry to the canal system or by a biologic

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