Cytoplasm is a gelatinous, semi-transparent fluid that fills much of the volume of cells. Eukaryotic cells contain organelles, such as mitochondria, that are filled with liquid that's kept separate from the cytoplasm by cell membranes. Constituents The cytoplasm has three major elements; the cytosol, organelles and inclusions. The cytosol is the translucent fluid in which the other cytoplasmic elements are suspended. The cytoplasm holds organelles and protects them, such as the vacuole, endopla… (More on Cytoplasm)