Introduction

Introduction



Section contents



1. Introduction 3

2. The cellular level of organization 11

3. Tissues, organs, systems and homeostasis 19


Section introduction


The first section of this text includes material which is necessary to understand subsequent sections. The section begins with the characteristics of living matter through the cellular level up to tissues, organs and systems.


At the cellular level of organization the plasma membrane, which contains the cellular contents and also controls the intracellular environment, is considered. The transport processes which work to exchange molecules and water between the extracellular and intracellular environments are described and the processes whereby cells divide to produce identical daughters is introduced.


The concept of homeostasis, which maintains the internal environment of the organisms, is introduced. Homeostasis is a unifying concept in physiology as it involves all of the systems working together to respond to changing circumstances and stresses imposed upon the organism by changes in the external environment or, in some cases, by disease.

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Jul 18, 2016 | Posted by in NURSING | Comments Off on Introduction

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