Select the correct answer. In what order do these three organ systems of the human body operate during a reflex arc in response to a stimulus of sharp pain to the hand?
A.
muscular, nervous, skeletal
B.
nervous, muscular, skeletal
C.
skeletal, nervous, muscular
D.
skeletal, muscular, nervous

In an experiment examining the effects tai chi on arthritis pain, callahan (2010) selected a large sample of individuals with doctor-diagnosed arthritis. half of the participants immediately began a tai chi course and the other half (the control group) waited 8 weeks before beginning. at the end of 8 weeks, the individuals who had experienced tai chi had less arthritis pain that those who had not participated in the course.