This introductory book for undergraduate students poses a question: What is bioengineering all about? After offering a reference frame and defining the objectives (chapter 1), ¿physiology¿ (chapter 2) is presented as a source material followed by ¿signals¿ (chapter 3) and ¿signal pick up¿ (chapter 4). Chapter 5 deals with the biological amplifier. Reading the signal and the need for mathematical models are the subject matter, respectively, of chapters 6 and 7, they only provide guidance. The last chapter tries to look ahead. Sometimes, the subject is treated in relative depth, at times, the visit is more superficial. Formation rather than information is favored. Historical shots supply background material and spicy insights. Style is light, sprinkled with a little humor. There are exercises which allow students to learn independently.