Cell and membrane transport

Important molecule necessary for the functioning of the cell need to be transported from the external environment to the cell or from organelles to the cytoplasm in the cell. The cell does this through the help of proteins that aid the active transport and facilitated diffusion of these molecules into and out of the cell. Types of proteins within the plasma membrane which aid the movement of substances across the cell membrane are transport proteins, receptors and enzymes.

Also see intracellular Ca²⁺ transport