Introduction to Energy Flow

In this rest of this lecture and in the next, we will discuss what happens to digested food after it has been absorbed in the intestine, including how energy is transferred from one substance to another. We will learn about the forces that cause water and solutes to move passively across membranes. We will learn to distinguish between substances that move by simple diffusion and those that move by facilitated diffusion. We will review the mechanisms by which substances are moved across membranes against a concentration gradient. Enzymes control the metabolic activities of our cells. We will learn what enzymes do and how they do it.

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