Use of models in science- modelling physiological processes What is a scientific model? Why are scientific models useful? Describe two models of all or part of the human digestive system. Compare the two models; in what way are they useful to us, and what are their limitations? To what extent are they accurate representations of the real world? Use of models in science- modelling physiological processes What is a scientific model? Why are scientific models useful? Describe two models of all or part of the human digestive system. Compare the two models; in what way are they useful to us, and what are their limitations? To what extent are they accurate representations of the real world?