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

Explain complex or undefined media, Explain Complex or Undefined Media? ...

Explain Complex or Undefined Media? Here, the exact composition of the medium is not known. It contains some complex components of plant and animal extracts whose exact chemica

Which processes help bring oxygen to the body cells, Which of the following...

Which of the following processes help bring oxygen to the body cells that are in a leg? A. Net flux of oxygen from red blood cells into blood plasma in the body capillaries in

Explain the principle of microscopy, Explain the Principle of Microscopy? ...

Explain the Principle of Microscopy? When the light passes from one medium to another, refraction occurs, i.e., the ray is bent at the interface. The direction and the magnitud

Chicken infectious anemia (cia), C h ic k e n infectious anemia (CIA) ...

C h ic k e n infectious anemia (CIA) Chicken infectious anemia virus (CIAV), a member of genus Gyrovirus of the family Circoviridae, is the causative agent of chicken infe

Bone growth and development calcification of osteoid tissue, Define Bone gr...

Define Bone growth and development calcification of osteoid tissue? Vitamin D participates in metabolic processes associated with bone growth and development. It is involved i

Differences between axon and dendrite, DIFFERENCE S BETWEEN AXON AND DENDR...

DIFFERENCE S BETWEEN AXON AND DENDRITE (DENDRON) AXON DENDRIT E (DENDRON) 1. It is single per neur

What is meant by the peripheral nervous system, Q. What is meant by the per...

Q. What is meant by the peripheral nervous system (PNS)? The peripheral nervous system comprehends the ganglia and nerves of the body.

In what ways does over-grazing lead to soil erosion, In what ways does over...

In what ways does over-grazing lead to soil erosion? Over-grazing leads to erosion because (i) the animals delete all the vegetation, so exposing the soil to heavy rain, (ii) t

Explain sodium alginate, Explain Sodium alginate Sodium alginate helps ...

Explain Sodium alginate Sodium alginate helps in aiding cloud retention and inhibits clarification in orange squash and crush. It has been used as the most efficient stabilizer

Explain shear pin model, Q. Explain Shear Pin Model? Shear Pin Model: I...

Q. Explain Shear Pin Model? Shear Pin Model: In this type, a shearing force is applied using a pin to shear the food Product. We are rupturing the element of the food product b

Write Your Message!

Name

Email id

Message

Verfication Code

User Account

All Pages