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HUMAN PHYSIOLOGY

A response is to amplify the change in the variable. This has a destabilizing effect, so does not result in homeostasis. Positive feedback is less common in naturally occurring systems than negative feedback, but it has its applications. For example, in nerves, a threshold electric potential triggers the generation of a much larger action potential. Blood clotting and events in childbirth are other types of positive feedback. | Human Physiology by Wikibooks contributors From Wikibooks the open-content textbooks collection Copyright 2006-2007 Wikibooks contributors. This book is published by Wikibooks contributors. Permission is granted to copy distribute and or modify this document under the terms of the GNU Free Documentation License Version 1.2 or any later version published by the Free Software Foundation with no Invariant Sections no Front-Cover Texts and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License . Image licenses are listed in the section entitled Image Credits. Main authors Provophys C Whiteknight C RiRi82 C Jcran69 C Scout21972 C Jtervortn C DorothyD C VWilkes C Jacquel C Danyellmarie C Keith davis C Mperkins C Never2late C Shellybird2 C BriannaLenford C Jen A C Pwoodson C Nataliehaveron C Melissasmith C Brentwaldrop C Cover Der Mensch als Industriepalast Man as Industrial Palace by Fritz Kahn. The current version of this Wikibook may be found at http en.wikibooks.org wiki Human_Physiology Contents Introduction.3 Chapters.4 01. Homeostasis.4 02. Cell Physiology.14 03. The Integumentary System.35 04. The Nervous System.54 05. Senses.81 06. The Muscular System.107 07. Blood Physiology.122 08. The Cardiovascular System.137 09. The Immune System.162 10. The Urinary System.186 11. The Respiratory System.201 12. The Gastrointestinal System.217 13. Nutrition.244 14. The Endocrine System.262 15. The Male Reproductive System.281 16. The Female Reproductive System.301 17. Pregnancy and Birth. 326 18. Genetics and Inheritance.351 19. Development Birth Through Death.370 Appendices.397 A. Answers to Review Questions.397 About the Book.424 History Document Notes.424 Authors Image Credits.425 GNU Free Documentation License.426 Introduction Human physiology is the study of the functioning of the normal body and is responsible for describing how various systems of the human body work. Explanations often begin at a macroscopic level