The physical component of the human organism, the human body is made up of living cells and extracellular materials and is divided up into tissues, organs, and systems. For definite inclusion of the body's biochemical constituents, see protein; carbohydrate; lipid; an amino acid; vitamin; also a hormone. See cell for information about the structure and function of the body's cells. Major body structures are described in many entries. See the abdominal cavity, for instance; adipose tissue; aorta; bone; brain; ear; eye; heart; kidney; intestine large; lung; nose; ovary; pancreas; the pituitary; intestine small; neural tube; spleen; stomach; testis; thymus; the thyroid; tooth; uterus; spinal column.
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