The cytoplasm's the part of a cell that's enclosed within the plasma membrane. In eukaryotic cells, the cytoplasm contains organelles, such as mitochondria, which are filled with liquid that's kept separate from the rest of the cytoplasm by biological membranes. The cytoplasm's the site where most cellular activities occur, such as many metabolic pathways like glycolysis, and processes such as cell division. The inner, granular mass's called the endoplasm and the outer, clear and glassy layer's… (More on Cytoplasm)