Membrane Structure

Chemically, the cell membrane is mainly composed of lipids and proteins, with some carbohydrate. Its basic framework is a double layer (bilayer) of phospholipid molecules (see chapter 2 and fig. 2.14fo) that self-assemble so that their water-soluble (hydrophilic or "water-loving") "heads," containing phosphate groups, form the surfaces of the membrane, and their water-insoluble (hydrophobic or "water-fearing") "tails," consisting of fatty acid chains, make up the interior of the membrane (see figs. 3.3 and 3.6). The lipid molecules can move sideways within the plane of the membrane, and collectively they form a thin, but stable fluid film.

Essentials of Human Physiology

Essentials of Human Physiology

This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.

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