The electron transport chain is a series of protein complexes located at the inner membrane of the mitochondria. Format Diagram Credit Figure by MIT OpenCourseWare. MIT OpenCourseWare Course of Origin 12.007 Geobiology, Spring 2007 MIT Course Instructor Summons, Roger MIT Department Earth, Atmospheric, and Planetary Sciences License http://ocw.mit.edu/terms Publisher MIT OpenCourseWare