1.   ...the skeletal system.

2.   Her daily routine requires two periods of rigorous exercise, something prescribed for all cosmonauts to keep their cardiovascular, muscle and skeletal systems in good health.

3.   Larry Nelson also was an important part of that tour skeletal system, something he can be expected to demonstrate again soon.

4.   Others will assess the responses of his skeletal system, blood pressure, balance and immune systems.

5.   The connective tissue abnormality most often affects the tissues that support the skeletal system, the eyes and the cardiovascular system.

6.   The fliers are engaged in a range of other medical experiments documenting changes in their muscle and skeletal systems as well as a variety of physics and biotechnology investigations.