Biology (MindTap Course List)

11th Edition
Eldra Solomon + 3 others
Publisher: Cengage Learning
ISBN: 9781337392938



Biology (MindTap Course List)

11th Edition
Eldra Solomon + 3 others
Publisher: Cengage Learning
ISBN: 9781337392938
Chapter 42.1, Problem 2C
Textbook Problem

What are some trends in the evolution of nervous systems?

Summary Introduction

To determine: Trends in the evolution of nervous systems.

Introduction: Different type of organisms has different nervous systems which have evolved during the evolution accordingly. The complexity of the nervous system of the organism increases with increasing complexity of the cellular organization. For example, invertebrates have a much simpler nervous system compared to vertebrates.

Explanation of Solution

The nervous system is a very important part of living organisms. It performs different biological and physiological functions such as conduction of signals from one part of the body to another, controlling different metabolic activities, and receiving stimulus through different sensory organs. With the course of evolution, the nervous systems of different organisms have evolved differently according to their needs.

Some of the basic trends that were followed during the evolution of nervous systems are:

  • Increased neural cell count with increasing body complexity.
  • Change in concentrations of nerve cells.
  • Nervous systems have adapted to allow organism to perform special functions.
  • Complexity in the nervous system of different organisms has also changed with evolution.
  • The concentration of neural organs in the forward direction of the organism that is towards its head is known as cephalization...

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Chapter 42 Solutions

Biology (MindTap Course List)
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