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The plasma membrane is a double layer or lipids. Inside proteins are embedded. Some proteins extend through the whole lipid bilateral and others only go through one face. Some lipids have attached sugar groups. The plasma membrane acts as an external cell barrier. It also transports substances into or out of the cell. The plasma membrane also maintains a resting potential, essential for functioning excitable cells. It acts as receptors for hormones, neurotransmitters, and more.
The cytoplasm is the cellular region between the nuclear and plasma membranes. It consists of fluid cytosol, which contains dissolved solutes, organelles (the metabolic machinery of the cytoplasm), and inclusions (stored nutrients).
The Nucleus is the largest organelle. It is surrounded by the nuclear envelope, the double-membrane structure. It contains fluid, nucleoplasm, nucleoli (site of ribosome subunit manufacture), and chromatin (where DNA constitutes the genes). It's function is to be a place of storage for nutrients, wastes, and cell products.
Plasma Membrane, Cytoplasm, Nucleus
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