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Lipids are fats. Their primary purpose in the body is energy storage- a very small mass of lipids can store a very large amount of energy, which is excellent if you don't happen to have a ready energy supply around. In adipose tissue, lipids can also serve as cushioning.

Answer:Lipids are long term energy storage in comparison to carbs, which are for short-term usage.

Answer:

  • Structuring cell membranes. The cell membrane constitutes a barrier for the cell and controls the flow of material in and out of the cell.
  • Energy storage. Triglycerides are an efficient form of energy storage that can be mobilized when fuel is needed.
  • Transmission of information in cells (signal transduction). Lipid hormones, like steroids and eicosanoids, also mediate communication between cells.
  • Cellular metabolism. The fat-soluble vitamins A, D, E, and K are required for metabolism, usually as coenzymes.

Energy storage, cell membrane stabilizers, substrates for other molecules, and provision of adipose tissue for warmth and protection - especially in cold climates.

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