The list below includes three organ systems that
are directly used when a human runs.
circulatory system
muscular system
skeletal system
Which system should also be included in the list?
(1) immune system (3) digestive system
(2) reproductive system (4) nervous system
are directly used when a human runs.
circulatory system
muscular system
skeletal system
Which system should also be included in the list?
(1) immune system (3) digestive system
(2) reproductive system (4) nervous system