Do any textbooks have audio components available?
It depends. It is best to search the first few pages or the last few pages of your text for a link to additional resources online. Some publishers offer this perk while others do not. For example, nursing students can access audio summaries of thier primary books on evolve.elsevier.com. Once a free account is created, one can simply go to resources to access the audio files located in the "key points" section of each chapter. For more information you can always ask your professor about these components.