The human body is made up of cells, and within every cell is a nucleus — everything else contained within the cell walls is the cytoplasm.

This is one of many technical terms for the little building blocks of life within us all. Cytoplasm consists of all the substances within the cell walls but outside of the nucleus: a fluid called cytosol, organelles such as the mitochondria, and tiny particles in suspension called inclusions. Cytoplasm is full of proteins, which are essential to your body. Cytoplasm is also called protoplasm. To see cytoplasm, you'll need a good microscope. To understand cytoplasm, you'll need a good biology teacher.

Definitions of cytoplasm
  1. noun
    the protoplasm of a cell excluding the nucleus; is full of proteins that control cell metabolism
    synonyms: cytol
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    multinucleate sheet of cytoplasm characteristic of some stages of such organisms as slime molds
    the intact cytoplasmic content of a cell
    the aqueous part of the cytoplasm within which various particles and organelles are suspended
    the outer granule-free layer of cytoplasm
    the inner portion of the cytoplasm of a cell
    ground substance, hyaloplasm
    the clear nongranular portion of the cytoplasm of a cell
    central body, centrosome
    small region of cytoplasm adjacent to the nucleus; contains the centrioles and serves to organize the microtubules
    the cytoplasm of a striated muscle fiber
    a mass of cytoplasm containing several nuclei and enclosed in a membrane but no internal cell boundaries (as in muscle fibers)
    type of:
    living substance, protoplasm
    the substance of a living cell (including cytoplasm and nucleus)
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