Darrell's father used the phrase, “use it or lose it." What neuronal activIties are related to this idea

Students in biology are studying the macromolecules of life. they used a calorimeter to determine the calories in various types of food. once the lab was completed, the students ate the left over food samples. monica commented that in just 6 or 7 "chews" of the saltine, it was gone; nothing but a sticky paste in her mouth. elaborate on what happened chemically while chewing the saltine. include the macromolecules present.

Which part of the cell is affected by the movement of molecules through diffusion, osmosis and active transport?

In what part of the body does the most muscle activity happen?