Evolution of heart in higher animals, Biology

Evolution of heart in higher animals

The circulatory system in higher animals has undergone several changes during evolution.
The heart has become totally muscular.
The heart has two chambers in fishes - one auricle and one ventricle. It is a branchial heart.
In amphibians like frog the heart is made up of three chambers
It has two auricles and one ventricle.
In reptiles like lizards, the ventricle is incompletely divided.
So, it is an incompletely divided four chambered heart.
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

Is there a larval stage in echinoderms, Q. Is there a larval stage in echin...

Q. Is there a larval stage in echinoderms? In echinoderms embryonic development is indirect, with ciliated larvae.

Explain benefits of protein, Explain benefits of Protein Protein: Once ...

Explain benefits of Protein Protein: Once the energy requirements have been estimated, protein requirements can be addressed. The aim is to achieve nitrogen balance. There are

Potassium ion can pass easily through cell membranes, In the human body, th...

In the human body, the potassium ion can pass easily through cell membranes, yet the potassium ion concentration is higher inside many cells than it is outside these cells. Could t

Seating the abutment, Q. Show the Seating the abutment? The clinician w...

Q. Show the Seating the abutment? The clinician will need to ensure that the abutment is completely seated.A radiograph may be required to confirm complete seating. Abutments u

Starch, S T ARC H - Polymer of a-D-glucose. Starch is glucosan...

S T ARC H - Polymer of a-D-glucose. Starch is glucosan homopolysaccharide which is the major reserve food of plants. Starch is formed as an end product of photosynt

Define regulation of water balance for the kidneys, Define Regulation of Wa...

Define Regulation of Water Balance For the kidneys? The kidneys are highly efficient conservators of body water. Although the kidneys filter 180 L of blood per day (125 ml / mi

Who was charles darwin, Who was Charles Darwin? The Charles Darwin was ...

Who was Charles Darwin? The Charles Darwin was an English naturalist born in 1809 and considered the father of the theory of evolution. By the end of the year 1831, before turn

What are the poriferans, Q. What are the poriferans? The phyla Porifera...

Q. What are the poriferans? The phyla Porifera include the simplest creatures of the animal kingdom. Sponges are aquatic sessile beings they are not able to move by themselves

Cell theory, CEL L THEORY Proposed by Mathias Jacob Schleiden, 1838 (J...

CEL L THEORY Proposed by Mathias Jacob Schleiden, 1838 (Jerman Botanist), Theodore Schwann, 1839 (Jerman Zoologist) It consists of 5 fundamental facts - (i) Body of livi

Potential and excitation threshold for neurons, Q. How different are the co...

Q. How different are the concepts of action potential, resting potential and excitation threshold concerning neurons? Action potential is the maximum positive voltage level ach

Write Your Message!

Name

Email id

Message

Verfication Code

User Account

All Pages