Cytoplasmic Membrane: Structure, Primary Function, Cytoplasm and Cytoplasmic Organelles

It serves as an asymmetric molecular covering that divides all existing cells.

Structure of the Cytoplasmic Membrane

The Cytoplasmic Membrane is composed of:

  • Bimolecular layer of lipids.
  • Proteins in the bimolecular layer.
  • Carbohydrates

Primary Function of the Cytoplasmic Membrane

Its purpose is to be a permeable barrier between cells and their environment so that vital functions can be performed and in turn release other undesirable functions.

The Cytoplasmic Membrane also performs the process known as endocytosis , which consists of external molecules entering some types of cells and then releasing substances within the cell from a vesicle.

Subsequently, the substance is digested by the lysosomes and then the exocytosis process occurs, which consists of a cell directing the content of the secretory vesicles of the cell membrane in the extracellular space.

The Cytoplasmic Membrane on its external face has important functions with the cells that surround it, therefore, the proteins linked to the molecular receptors are responsible for recognizing the hormones and the immune responses of the organism.


The membrane separates the cytoplasm from the external environment and this is the cellular content of a nucleus.

The cytoplasm presents a substance that is formed by a colloidal solution that is composed of organic, inorganic substances and water, known as cytosol.

For the body, the cytosol is very important because thanks to it a high percentage of cellular metabolism is produced, as well as the cytoplasmic organelles.

Cytoplasmic organelles

Cytoplasmic organelles are composed of:

  • Membranosos.
  • No membranosos.

The membranous are those that have a membrane that is linked to the cytoplasm of the prokaryotic cell, of which they are mentioned below:

Mitochondria : it has a tubular shape and is composed of:

  • Double membrane.
  • Membrana exterior lisa.
  • Inner membrane.

This particular membrane has folds called mitochondrial ridges.

The mitochondria in its interior is composed of a liquid called matrix, which is the home of ribosomes and also has a DNA fragment.

Among the qualities that the mitochondria presents is that it can double until it reaches an average point of 2000 units.

They are responsible for the oxidation that organic compounds must have to result in ATP energy, which serves to restore the consumption of the muscles when they are in sports activities.

Its functions include:

  • Achieve cellular respiration.
  • Eliminate the degradation of organic compounds.
  • Synthesize energy from ATP.

Endoplasmic reticulum : they are a group of membranes that are responsible for registering or evaluating the interior of the cytoplasm.

This set of membranes are very similar to the cytoplasmic. Its function aims to participate in the training of:

  • Lipids
  • Hormones
  • Additionally, it can transport various substances such as proteins and fats.

Golgi complex: is the set of flattened and stacked vesicles. They are formed by:

  • Lipoproteins.
  • Lipids

Its function is to elaborate the secretions of the type of tissue to which they belong.

Nuclear membrane: consists of two layers but its structure is similar to the cytoplasmic. It has ribosomes on the surface of the outer layer and also pores that facilitate the exchange of fluids from the nucleus with the cytoplasm.

This membrane is essential during the interphase period for the life of the cell.

Lysosomes: it is composed of enzymes that are produced or created by the Golgi Complex and in turn by the Endoplasmic Reticulum.

It is responsible for cellular digestion, which takes place in the particles ingested by the cells that are the product of endocytosis.

The non-membranous ones, as their name indicates, are those that do not have membranes and are divided into:

Centrioles: they are made up of proteins and are an important part of cell division by mitosis.

Ribosomes: they are globular in appearance and are made up of two subunits. They are generated in the nucleus and their composition is based on:

  • Water.
  • ARN.
  • Proteins

Its main mission is to participate in the synthesis of proteins. Muscular activity is linked to this organism because it nourishes them with the proteins that the body loses when it is in sports activities.

Nucleus: it has a spherical shape and is formed by the nuclear membrane, which demarcates the factoroplasm, a place where the chromosomes and nucleoli are immersed.