<P> Organelles (literally "little organs"), are usually membrane - bound structures inside the cell that have specific functions . Some major organelles that are suspended in the cytosol are the mitochondria, the endoplasmic reticulum, the Golgi apparatus, vacuoles, lysosomes, and in plant cells, chloroplasts . </P> <P> The inclusions are small particles of insoluble substances suspended in the cytosol . A huge range of inclusions exist in different cell types, and range from crystals of calcium oxalate or silicon dioxide in plants, to granules of energy - storage materials such as starch, glycogen, or polyhydroxybutyrate . A particularly widespread example are lipid droplets, which are spherical droplets composed of lipids and proteins that are used in both prokaryotes and eukaryotes as a way of storing lipids such as fatty acids and sterols . Lipid droplets make up much of the volume of adipocytes, which are specialized lipid - storage cells, but they are also found in a range of other cell types . </P> <P> The cytoplasm, mitochondria and most organelles are contributions to the cell from the maternal gamete . Contrary to the older information that disregards any notion of the cytoplasm being active, new research has shown it to be in control of movement and flow of nutrients in and out of the cell by viscoplastic behavior and a measure of the reciprocal rate of bond breakage within the cytoplasmic network . </P> <P> The material properties of the cytoplasm remain an ongoing investigation . Recent measurements using force spectrum microscopy reveal that the cytoplasm can be likened to an elastic solid, rather than a viscoelastic fluid . </P>

What do cytoplasm do in an animal cell