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Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892

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BuyFindarrow_forward

Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892
Textbook Problem

Apply Evolutionary Thinking What is the evolutionary advantage of closure of the septum between the two ventricles to create a double circulatory system?

Summary Introduction

To review:

The closure of the septum between the two ventricles to create a double respiratory system as an evolutionary advantage.

Introduction:

Animal circulatory system is the network of blood vessels to supply oxygen (O2) and other nutrients to the tissues via heart and removing waste materials such as carbon dioxide (CO2). It can either be the open circulatory system or closed circulatory system. The invasion of terrestrial habitats by the different vertebrate groups led to an evolutionary trend.

Explanation

In mammals, crocodilians, and birds, the heart is divided into two by the septum resulting in the production of four-chambered heart that consists of two atria and ventricles. The blood is pumped by each ventricles operating in a completely separate circuit for pulmonary and systemic circulation.

So, depending upon the organisms, the heart may consist of one or two atria and one or two ventricles. The single blood circulation comprises an atrium and ventricle, whereas double circulation consists of one or two atria and one or two ventricles...

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