The endomembrane system, which is present in eukaryotic cells, is a collection of membranes and organelles that work communally to modify, sort, package and transport proteins and lipids. It consists of the following organelles:

• Nuclear membrane – consists of two lipid bilayer membranes, embedded with proteins, that surrounds the nucleus and protects its genetic material.
• Endoplasmic reticulum – is an organelle made up of two subunits, a smooth and rough endoplasmic reticulum. It is responsible for synthesizing lipids and proteins.
• Golgi apparatus – is an organelle consisting of multiple cisternal stacks that is responsible for modifying, packaging and transporting proteins and lipid molecules.
• Lysosomes – an organelle containing digestive enzymes for digesting macromolecules, old cell parts, microorganisms, etc.
• Endosomes – sorting organelles that originate from the trans-Golgi network and are part of the endocytic membrane transport pathway.
• Vesicles – a small enclosed lipid bilayer containing cytoplasm and materials for transport.
• Plasma membrane – lipid bilayer that encompasses all of the cells components and separates the interior of the cell from the outside environment. All the aforementioned organelles are housed within the plasma membrane.