Dictionary > Endomembrane

Endomembrane

Definition
noun, plural: endomembranes
The membraneous components in a cell, i.e. nuclear envelope, endoplasmic reticulum, Golgi apparatus, lysosomes, endosomes, vesicles, and the cell membrane, acting as a single functional and developmental unit
Supplement
The endomembrane refers to the membranous components within the eukaryotic cell. These membranous components include the membranes of nucleus (i.e. nuclear envelope), endoplasmic reticulum, Golgi apparatus, lysosomes, endosomes, vesicles, and the cell membrane. It does not include the membranes of mitochondria and/or chloroplasts. The membranes of the organelles included in the endomembrane system may be related through direct contact, e.g. the nuclear envelope being connected to the endoplasmic reticulum, and the latter to the Golgi apparatus, or by indirect contact, e.g. by the transfer of membrane segments as vesicles. In general, the endomembrane system is involved in the manufacturing and distributing cellular products. However, each of these organelles performs specific functions within the cell. For instance, the endoplasmic reticulum is involved in the synthesis of various biomolecules. The Golgi apparatus is involved in the packaging of biomolecules newly synthesized from the endoplasmic reticulum. The membranes of these organelles may also vary in structure. For instance, some of them consist of two lipid bilayers (e.g. nuclear envelope) while others are comprised of only one (e.g. lysosome). Nevertheless, their membranes share the same fundamental structure in a way that they are a lipid bilayer with proteins attached or traversing the lipid bilayer.
Word origin: Greek endo- (within) + membrane
See also:

Related term(s):

  • endomembrane system


  • You will also like...

    Population Regulation in an Ecosystem
    Population Regulation in an Ecosystem

    With regard to the population size of a species and what factors may affect them, two factors have been defined. They ar..

    Carbohydrates, fats and proteins - dietary sources
    A Balanced Diet – Carbohydrates and Fat

    Apart from vitamins, the human body also requires high energy sources such as carbohydrates and fats. If you want an ove..

    An artistic depiction of Dunkleosteus fish
    Fish

    The sea was teeming with life. Eventually, through reproduction and continued variation, fish came about. There are over..

    primitive arthropods
    Arthropods

    The arthropods were assumed to be the first taxon of species to possess jointed limbs and exoskeleton, exhibit more adva..

    Circulation
    Circulation

    The circulatory system is key to the transport of vital biomolecules and nutrients throughout the body. Learn about the ..

    Sensory systems
    Sensory Systems

    A sensory system is a part of the nervous system consisting of sensory receptors that receive stimuli from the internal ..

    Related Articles...

    No related articles found

    See all Related Topics