A student is walking down the street on her way to school. When she looks ahead of her, she sees her friend and wants to run to catch up to her. She begins to move her legs forward and backwards to catch up to her friend. As she runs, her breathing increases followed by an increase in her heart rate. Eventually, she catches up to her friend. Which of these best identifies a pathway of systems in the student's body, as described in this scenario?
A. nervous system→ musculoskeletal system → circulatory system→ respiratory system
B. nervous system→ musculoskeletal system → respiratory system→ circulatory system
C. musculoskeletal system → nervous system→ circulatory system→→ respiratory system
D. musculoskeletal system→ nervous system→→→ respiratory system circulatory system