Intrinsic and extrinsic motivations of undergraduate students enrolled in human anatomy and physiology, physics, and nutrition courses were explored with course discipline-specific adapted versions of the Academic Motivation Scale. Information on students' study habits and efforts, and final course grades were also collected. Results revealed the adapted versions of the Academic Motivation Scale had comparable reliabilities to previous investigations, significant differences in motivations across the students enrolled in the three courses and significant influences of motivation on academic behaviors and course performance.