Evolution of heart in higher animals, Biology

Assignment Help:
Evolution of heart in higher animals
  1. The circulatory system in higher animals has undergone several changes during evolution.
  2. The heart has become totally muscular.
  3. The heart has two chambers in fishes - one auricle and one ventricle. It is a branchial heart.
  4. In amphibians like frog the heart is made up of three chambers 
  5. It has two auricles and one ventricle.
  6. In reptiles like lizards, the ventricle is incompletely divided.
  7. So, it is an incompletely divided four chambered heart.
  8. In birds and mammals, the heart is completely divided into four chambers with two auricles and two ventricles. It is a pulmonary heart.

Related Discussions:- Evolution of heart in higher animals

Carpentier -edwards valve-biological valves, Carpentier -Edwards Valve (C-E...

Carpentier -Edwards Valve (C-E) :  This is porcine aortic valve preserved in gluteraldehyde and mounted on flexible stent made of cobalt-chromium-nickel alloy (ELGILOY). Glut

Obtain half their genes from one parent, If children obtain half their gene...

If children obtain half their genes from one parent and half from the other parent, why aren't siblings identical?

Histamine - monoamine transmitter group, A fifth member of the monoamine tr...

A fifth member of the monoamine transmitter group is histamine. That release histamine as their neurotransmitter is located in the hypothalamus and project to cerebral cortex, lim

Describe the intensity of s2 in second heart, Describe the Intensity of S 2...

Describe the Intensity of S 2 in second heart ? Loud A 2 occurs in patients with hypertension, when aorta is closer to anterior chest wall owing to root dilatation or TGA or

What is the difference between vital and natural amino acid, Q. What is the...

Q. What is the difference between vital and natural amino acids? Essential amino acids are those that the organism is not capable to synthesize and that need to be ingested by

Name the primary and secondary minerals found in soils, Name the Primary an...

Name the Primary and secondary minerals found in soils Minerals such as silicate clays and iron oxide, which are formed by breakdown and weathering of less resistant materials,

Causes of hypoglycaemia, Since hypoglycaemia can occur in any diabetic pati...

Since hypoglycaemia can occur in any diabetic patient at any time, it is important for you to learn the causes of hypoglycaemia. Such knowledge will help you to educate the patient

Discuss haematoxylin and its subtypes in detail, Question 1 Discuss how yo...

Question 1 Discuss how you would perform mounting of stained sections. List commonly used mounting media in histopathology laboratory. Add a note on advantages and disadvantages o

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