When the athlete runs, her body must coordinate multiple organ systems. Choose the best
explanation for which systems work together during running.
The skeletal and digestive systems because the skeleton supports the body and
digestive functions are suspended during exercise.
The nervous and endocrine systems because running requires sensory input and the
hormone adrenaline.
Muscular and urinary systems because running uses powerful leg muscles and urinary
functions are suspended during exercise.
Circulatory and muscular systems because the arteries bring oxygenated blood to the
muscles to do cellular respiration while running.