Introduction. Elements of the Anatomy and Physiology of the Respiratory System. The Circulatory System and the Heart. Blood and the Red Blood Cell. Capnometry and the Computerized Psychophysiological Profile. Some Functional Relationships Between Hyperventilation and the Endocrine, Cardiovascular, and Nervous Systems. Respiration, Hyperventilation, and Mental Disorders. Behavioral Treatment and Control of Hyperventilation. Behavioral Assessment and Breathing Training in the Treatment of Hyperventilation and Asthma. Conclusion.Fried, R. is the author of 'Psychology and Physiology of Breathing In Behavioral Medicine, Clinical Psychology, and Psychiatry' with ISBN 9780306442780 and ISBN 0306442787.