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Principles of Medical Physiology
2nd edition
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Dedicated to the memory of my parents
Who were the best teachers I have ever known
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Principles of Medical Physiology
2nd edition
Sabyasachi Sircar, MD
Professor and Head of Department of Physiology
All India Institute of Medical Sciences
Jodhpur, Rajasthan
India
811 Illustrations
116 Tables
19 Text Boxes
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1st Edition Published in 2007. sources. For example, readers are advised to check the
product information sheet included in the package of
Principles of Medical Physiology / each drug they plan to administer to be certain that the
Sabyasachi Sircar, 2nd ed. information contained in this publication is accurate and
that changes have not been made in the recommended
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This recommendation is of particular importance in
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VII
Preface to the Second Edition
The second edition of Principles of Medical Physi- ics, and Respiratory mechanics. Chapters 16 (Char-
ology remains committed to the quartet of utility, acteristics of Muscle Contraction) and 17 (Muscle
lucidity, brevity, and contextual relevance of the Elasticity) of the previous edition are merged into
text. The changes in this edition broadly fall in four a single chapter (Characteristics of Skeletal Muscle
categories: First, the errors that crept into the first Contraction) while Chapter 38 (Circulatory Pathway
edition are weeded out. Second, at the end of each & Hemodynamics) is split into two. Finally, if the
chapter, revision questions are added. The ques- first edition of the book was aimed at providing a
tions, which somewhat define the “learning objec- text that is “easy to understand”, the second edition
tives” of the chapter, are mostly conceptual though is aimed at making the text “easy to revise” by high-
some require only factual recall. Indeed, a quick look lighting important parts of the text so that the rigor-
at these questions before going through the chapter ous structure of the text comes alive, making it even
should provide the necessary focus for appreciating more suitable for reading at bedtime for relaxation!
the text. Third, several chapters have been substan- I welcome, indeed beseech, the feedback of read-
tially modified. Notable among them are the chap- ers which may be emailed to me at pmp.sircar@
ters on Membrane Excitation & Action Potential, gmail.com
Electrocardiography, Cardiac Output, Hemodynam-
Sabyasachi Sircar
January, 2014
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