Endomembrane System

Endomembrane System

Endomembrane is a system of membrane that is interconnected inside the cell.

Listed below are the parts of the endomembrane system. It is in the order of protein synthesis or translation.

Nuclear Membrane

  • it protects the DNA (genetic material) as well as the RNA
  • it is responsible for the release of RNA through the nuclear pores
  • has nuclear pores = needed so the the nucleotides (Adenine, Thyamine, Guanine, Cytosine, Uracil) can get into the nucleus
  • contains chromatin

Endoplasmic Reticulum (ER)

Rough Endoplasmic Reticulum

  • embrace or surrounds the nucleus
  • has ribosomes (not organelles because it is not enclosed in a membrane) attached on it giving it its rough appearance
  • helps in manufacturing proteins
  • buds off transport vesicles

Smooth Endoplasmic Reticulum

  • it is where the cell synthesize (makes) lipids, which are used for the membranes
  • stores calcium
  • attached to the rough ER

Golgi Apparatus

  • also known as golgi body and golgi complex
  • it packages proteins from the rough ER
  • it also sorts or categorizes the manufactured proteins whether it will be used by (in) the cell or outside the cell
  • it sorts the proteins by adding amino acid on the proteins to mark it
  • it transports the cells that are to be delivered outside the cell
  • buds off lysosomes


  • it looks like miniorganelles
  • membranes that contain proteins in them (ex. lysosomes in animals and peroxisomes in plants)
  • it also transports proteins

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