Final answer:
In health science, axial and appendicular describe the two main divisions of the human skeleton, which are considered body regions.
Step-by-step explanation:
The concepts of axial and appendicular refer to the major divisions of the human skeleton. The axial skeleton forms the central axis of the body, consisting of the skull, vertebral column, and thoracic cage, which serves to protect the brain, spinal cord, heart, and lungs. Additionally, it provides attachment points for muscles. The appendicular skeleton, on the other hand, includes the bones of the upper and lower limbs and the girdles (pectoral and pelvic) that attach these limbs to the axial skeleton. Given the context and descriptions, the answer to the student's question about what 'axial and appendicular' concepts define in the field of health science is that they are body regions.