The human body is made up of several distinct components, which differ in their chemical and structural characteristics. The extracellular compartment consists of support structures like bone lamellae, tendons and ligaments, and the extracellular fluid systems, blood plasma, and lymph. The totality of cells can be viewed as distinct from fatty tissue, which serves either as energy reserve (fat deposits), or as structural support or building material, as in cheeks or in the soles of the feet. The latter will be broken down only in extreme cases of nutritional deficiency or during illnesses accompanied by consumption. The fat deposits, however, may be subject to rather extreme fluctuations.
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