The Ninth Edition of Human Physiology: An Integrated Approach builds upon the thorough coverage of integrative and molecular physiology topics that have always been the foundation of this book. It has been nearly eight years since the last revision, and a lot has changed in the world of physiology and medicine, including the global SARS-CoV-2 pandemic. Studying the pathophysiology of COVID-19 made biomedical scientists aware of how the immune system influences body functions in ways we had not previously realized. In recognition of that fact, we have promoted the immune system from Chapter 24 in the last edition to Chapter 7, giving it new status as the third control system, coordinating with the nervous and endocrine systems through chemical signals.
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