Biology, 16.12.2021 20:00 adeanbates

The picture shows a model being used to explain how food is moved through the gastrointestinal (GI) tract. What do the fingers pushing the marble along represent? f The pressure of blood vessels surrounding the GI tract
g The production of fluids by the GI tract
h The contraction of muscles in the GI tract
j The electrical impulses from the nervous system to the GI tract

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