Lipid

Lipids are biological molecules that are generally insoluble in water and include fats, oils, waxes, phospholipids, and steroids. Their varied structures support energy storage, membranes, signaling, and surface protection.

Fatty acid: A carboxylic acid with a hydrocarbon chain, often incorporated into fats and membrane lipids. Its chain length and saturation help determine the physical properties of many lipids.
Lipid bilayer: A double layer of amphipathic molecules that forms the basic structure of cell membranes. Phospholipids spontaneously arrange into this barrier in water.
Cell membrane: A selectively permeable boundary separating a cell from its surroundings. Lipids provide its fundamental barrier and help control membrane properties.
Carbohydrate: A class of sugars and related molecules that commonly supplies energy and structural material. Carbohydrates are generally more water-compatible than fats and oils.
Cholesterol: A sterol found in animal cell membranes and used to synthesize steroid hormones and bile acids. Its biological roles and blood levels connect lipid chemistry to health.
Glycerol: A three-carbon alcohol that forms the backbone of many fats and phospholipids. It links fatty acids in triglycerides and anchors them in several membrane lipids.
Lipid metabolism: The biochemical synthesis, breakdown, and modification of lipids in organisms. It converts stored lipid energy and supplies molecules for membranes and signaling.
Adipose tissue: Connective tissue specialized for storing energy as fat and performing endocrine functions. It stores triglycerides and releases fatty acids when energy is needed.
Protein: A polymer of amino acids that performs structural, catalytic, transport, and regulatory functions. Proteins are built from amino acids, unlike the structurally diverse lipid group.
Atherosclerosis: A disease in which plaques build up within artery walls, restricting blood flow. Lipoprotein transport and cholesterol are central to its development and prevention.

Linked from 17 pages