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Biological membrane that separates the interior of a cell from its outside environment
The cell membrane (also known as the plasma membrane or cytoplasmic membrane, and historically referred to as the plasmalemma) is a semipermeable biological
Cell_membrane
Specialized subunit within a cell
given cell varies depending upon the function of that cell. The cell membrane and cell wall are not organelles. Other related structures: cytosol endomembrane
Organelle
Organelle in eukaryotic cells responsible for respiration
an organelle found in the cells of most eukaryotes, such as animals, plants and fungi. Mitochondria have a double membrane structure and use aerobic respiration
Mitochondria
Electric potential difference between interior and exterior of a biological cell
exterior of a biological cell. By convention it is written as Vm=Vinside−Voutside, so a negative membrane potential means the cell interior is negative relative
Membrane_potential
Basic unit of life forms
A biological cell basically consists of a semipermeable cell membrane enclosing cytoplasm that contains genetic material. Most cells are only visible
Cell_(biology)
Oxygen-delivering blood cell and the most common type of blood cell
and the blood. Each human red blood cell contains approximately 270 million hemoglobin molecules. The cell membrane is composed of proteins and lipids
Red_blood_cell
Type of membrane
acid tails. The plasma membrane that surrounds all biological cells is an example of a phospholipid bilayer. The plasma membrane is very specific in its
Semipermeable_membrane
Power generation technology
Proton-exchange membrane fuel cells (PEMFC), also known as polymer electrolyte membrane (PEM) fuel cells, are a type of fuel cell being developed mainly
Proton-exchange membrane fuel cell
Proton-exchange_membrane_fuel_cell
Bulge in the plasma membrane of a cell
In cell biology, a bleb (or snout) is a bulge of the plasma membrane of a cell, characterized by a spherical, "blister-like", bulky morphology. It is
Bleb_(cell_biology)
Organelle in eukaryotic cells
cell nucleus (from Latin nucleus or nuculeus 'kernel, seed'; pl.: nuclei) is a membrane-bound organelle found in eukaryotic cells. Eukaryotic cells usually
Cell_nucleus
Ability of cell membranes to deform elastically
A cell membrane defines a boundary between a cell and its environment. The primary constituent of a membrane is a phospholipid bilayer that forms in a
Elasticity_of_cell_membranes
Class of ligand activated receptors localized in surface of plama cell membrane
Cell surface receptors (membrane receptors, transmembrane receptors) are receptors that are embedded in the plasma membrane of cells. They act in cell
Cell_surface_receptor
Primary cell of the nervous system
across the cell membrane. Stimuli cause specific ion-channels within the cell membrane to open, leading to a flow of ions through the cell membrane, changing
Neuron
Biological membrane structure
thin polar membrane made of two layers of lipid molecules. These membranes form a continuous barrier around all cells. The cell membranes of almost all
Lipid_bilayer
Cell organelle that processes proteins
mainly toward the nucleus of the cell and SER towards the cell membrane or plasma membrane of the cell. The outer (cytosolic) face of the RER is studded with
Endoplasmic_reticulum
Bacteria that give a positive result in the Gram stain test
layer is much thinner and sandwiched between an inner cell membrane and a bacterial outer membrane, causing them to take up the counterstain (safranin or
Gram-positive_bacteria
Type of membrane protein that is permanently attached to the biological membrane
integral, or intrinsic, membrane protein (IMP) is a type of membrane protein that is permanently attached to the biological membrane. All transmembrane proteins
Integral_membrane_protein
Laboratory technique in electrophysiology
isolated living cells, tissue sections, or patches of cell membrane. The technique is especially useful in the study of excitable cells such as neurons
Patch_clamp
Cell theory has its origins in seventeenth century microscopy observations, but it was nearly two hundred years before a complete cell membrane theory
History of cell membrane theory
History_of_cell_membrane_theory
Enclosing or separating membrane in organisms acting as selective semi-permeable barrier
A biological membrane or biomembrane is a selectively permeable membrane that separates the interior of a cell from the external environment or creates
Biological_membrane
Proteins that are part of, or interact with, biological membranes
on their location. Integral membrane proteins are a permanent part of a cell membrane and can either penetrate the membrane (transmembrane) or associate
Membrane_protein
Protein complex
The membrane attack complex (MAC) or terminal complement complex (TCC) is a complex of proteins typically formed on the surface of pathogen cell membranes
Complement membrane attack complex
Complement_membrane_attack_complex
Thin fibrous layer between the cells and the adjacent connective tissue in animals
cell layer such as endothelium, and anchors it to the underlying connective tissue (stroma). A basement membrane also surrounds some individual cells
Basement_membrane
Quality of being toxic to cells
mechanistic features. Apoptosis (type I cell death) is characterized by nuclear condensation, cell shrinkage, membrane blebbing, and the formation of apoptotic
Cytotoxicity
Specialized anatomy and physiology of bacteria
bacterial cell and a typical human cell (assuming both cells are spheres) : The cell envelope is composed of the cell membrane and the cell wall. As in
Bacterial_cell_structure
Abnormal red blood cell with a spiked cell membrane
abnormal form of red blood cell that has a spiked cell membrane, due to thorny projections. A similar term is spur cells. Often they may be confused
Acanthocyte
Membranes in the cytoplasm of a eukaryotic cell
the different membranes (endomembranes) that are suspended in the cytoplasm within a eukaryotic cell. These membranes divide the cell into functional
Endomembrane_system
System of communication
freely across the bi-lipid layer of the plasma membrane, so their action is mediated by a cell membrane bound receptor. On the other hand, liposoluble
Cell_signaling
Protective outer structure of bacterial cells
The cell envelope comprises the inner cell membrane and the cell wall of a bacterium. In gram-negative bacteria an outer membrane is also included. This
Cell_envelope
Type of neuroepithelial cell
in the cell absorb photons, triggering a change in the cell's membrane potential. There are currently three known types of photoreceptor cells in mammalian
Photoreceptor_cell
Membrane-bound organelle in cells containing fluid
(/ˈvækjuːoʊl/) is a membrane-bound organelle which is present in plant and fungal cells and some protist, animal, and bacterial cells. Vacuoles are essentially
Vacuole
Cellular molecule transport mechanism against the concentration gradient
biology, active transport is the movement of molecules or ions across a cell membrane from a region of lower concentration to a region of higher concentration—against
Active_transport
Communications in cell biology
signal to the target cell. Thus, a post-synaptic membrane belongs to the membrane receiving the signal, while a pre-synaptic membrane is the source of the
Cell–cell_interaction
Viscosity of the lipid bilayer of a cell membrane
In biology, membrane fluidity refers to the viscosity of the lipid bilayer of a cell membrane or a synthetic lipid membrane. The particular types of lipids
Membrane_fluidity
Model of cell membranes
explains various characteristics regarding the structure of functional cell membranes. According to this biological model, there is a lipid bilayer (a two-molecule-thick
Fluid_mosaic_model
Movement of molecules to lower concentration
out of the cell and the cell shrinks. In doing so, the cell becomes flaccid. In extreme cases, the cell becomes plasmolyzed – the cell membrane disengages
Osmosis
Cell membrane of a muscle fibre
flesh, and lemma from Greek; sheath), also called the myolemma, is the cell membrane surrounding a skeletal muscle fibre or a cardiomyocyte. It consists
Sarcolemma
Group of bacteria that do not retain the Gram stain used in bacterial differentiation
that their cell envelope consists of a thin peptidoglycan cell wall sandwiched between an inner (cytoplasmic) membrane and an outer membrane. These bacteria
Gram-negative_bacteria
Species of archaeon
vaginosis). The cell wall and cell membrane of Methanobrevibacter smithii determine susceptibility to antibiotics and statins. The cell wall is composed
Methanobrevibacter_smithii
Measure of water potential across a semi-permeable cell membrane
partially-permeable cell membrane. Tonicity depends on the relative concentration of selective membrane-impermeable solutes across a cell membrane which determines
Tonicity
Protein family
Cell–cell fusogens are glycoproteins that facilitate the fusion of cell to cell membranes. Cell–cell fusion is critical for the merging of gamete genomes
Cell–cell_fusogens
Membrane protein involved in transportation
A membrane transport protein is a membrane protein involved in the movement of ions, small molecules, and macromolecules such as another protein, across
Membrane_transport_protein
Static membrane potential in biology
The relatively static membrane potential of quiescent cells is called the resting membrane potential (or resting voltage), as opposed to the specific dynamic
Resting_potential
Device that converts the chemical energy from a fuel into electricity
(GE), further modified the original fuel cell design by using a sulphonated polystyrene ion-exchange membrane as the electrolyte. Three years later another
Fuel_cell
Electrical properties of biological cells
is pressed against the cell membrane, to which it tightly adheres by an interaction between glass and lipids of the cell membrane. The electrolyte within
Electrophysiology
Outermost layer of some cells
A cell wall is a structural layer that surrounds some cell types, found immediately outside the cell membrane. It can be tough, flexible, and sometimes
Cell_wall
Change in a cell's electric charge distribution
that the potential difference across the cell membrane briefly reverses polarity, with the inside of the cell becoming positively charged. The change in
Depolarization
Breaking down of the membrane of a cell
from Greek λῠ́σῐς lýsis 'loosening') is the breaking down of the membrane of a cell, often by viral, enzymic, or osmotic (that is, "lytic" /ˈlɪtɪk/ LIT-ik)
Lysis
Method in molecular biology to make pores in cell membranes
technique in which an electric field is applied to cells to briefly increase the permeability of the cell membrane. The application of a high-voltage electric
Electroporation
Neuron communication by electric impulses
quick changes in voltage across a cell membrane. An action potential occurs when the membrane potential of a specific cell rapidly rises and falls. This "depolarization"
Action_potential
Method of measuring biological cell currents
measure the ion currents through the membranes of excitable cells, such as neurons, while holding the membrane voltage at a set level. A basic voltage
Voltage_clamp
Plasma membrane found in gram-negative bacteria
outer membrane is found in gram-negative bacteria. Gram-negative bacteria form two lipid bilayers in their cell envelopes - an inner membrane (IM) that
Bacterial_outer_membrane
Theory that living organisms are made up of cells
proposed the membrane theory of cell physiology. In this view, the cell was seen to be enclosed by a thin surface, the plasma membrane, and cell water and
Cell_theory
Combination in the membranes of cells
Lipid rafts are described as specialized structures, or as dynamic cell membrane microdomains. They are believed to be glycolipoprotein lipid microdomains
Lipid_raft
Medication for treating fungal infections
disrupting the integrity of the fungal cell membrane. Similar to azoles, allylamines disrupt the fungal cell wall synthesis through inhibition of the
Topical_antifungal
Type of cell found in muscle tissue
striated, and the cells contain myofibrils, myofilaments, and sarcomeres as the skeletal muscle cell. The cell membrane is anchored to the cell's cytoskeleton
Muscle_cell
Electrical potential difference in the heart
pacemaker current) is the slow, positive increase in voltage across the cell's membrane, that occurs between the end of one action potential and the beginning
Pacemaker_potential
Neurobiological terminology
Na+ enters the cell with more Na+ channels along the membrane opening, resulting in a rapid depolarization of the cell. Once the cell has been depolarized
Subthreshold membrane potential oscillations
Subthreshold_membrane_potential_oscillations
Type of white blood cell
secreted or inserted into the plasma membrane where they serve as a part of B-cell receptors. When a naïve or memory B cell is activated by an antigen, it proliferates
B_cell
Active transport and bulk transport in which a cell transports molecules out of the cell
portals at the cell plasma membrane called porosomes. Porosomes are permanent cup-shaped lipoprotein structures at the cell plasma membrane, where secretory
Exocytosis
Engineered component of a biological cell
artificial cell, synthetic cell or minimal cell is an engineered particle that mimics one or many functions of a biological cell. Often, artificial cells are
Artificial_cell
Transport that does not require energy
Passive transport is a type of membrane transport that does not require energy to move substances across cell membranes. Instead of using cellular energy
Passive_transport
Biological process in the heart
potentials every minute. The action potential passes along the cell membrane causing the cell to contract, therefore the activity of the sinoatrial node results
Cardiac_action_potential
A type of tissue
to the basement membrane via desmosomes. The intermediate cell layer is highly proliferative and, therefore, provides for rapid cell regeneration in response
Transitional_epithelium
Layer on the inner face of a cell membrane
specialized thin layer of cross-linked actomyosins attached to the cell membrane. In protists this part of the cytoskeleton is also known as the ectoplasm
Cell_cortex
Biological synthesis and degradation of lipids
and functional lipids, such as those involved in the construction of cell membranes. In animals, these fats are obtained from food and are synthesized by
Lipid_metabolism
Class of chemical compounds
of the cell membrane and to facilitate cellular recognition, which is crucial to the immune response and in the connections that allow cells to connect
Glycolipid
Family of waxy lipid molecules
bond. Ceramides are found in high concentrations within the cell membrane of eukaryotic cells, since they are component lipids that make up sphingomyelin
Ceramide
Biological junctions through which neurons' signals can be sent
traveling along the membrane of the presynaptic cell, until it reaches the synapse. The electrical depolarization of the membrane at the synapse causes
Chemical_synapse
Domain of life whose cells have nuclei
domain Eukaryota or Eukarya, which have a distinct cell nucleus (formed by a nuclear membrane), membrane-bound organelles and often complex cellular architecture
Eukaryote
Evolutionary theory
membranes of mitochondria and chloroplasts, and also bacterial cell membranes; and that cardiolipin is found only in the inner mitochondrial membrane
Symbiogenesis
Cellular process
brought into the cell. The material to be internalized is surrounded by an area of cell membrane, which then buds off inside the cell to form a vesicle
Endocytosis
Nuclear membrane surrounding the nucleus in eukaryotic cells
envelope, also known as the nuclear membrane, is made up of two lipid bilayer membranes that in eukaryotic cells surround the nucleus, which encloses
Nuclear_envelope
Cell membrane organelle
(/ˈlaɪsəˌsoʊm/) is a membrane-bound organelle that is found in all animal cells (except red blood cells), and rarely in plant cells. There are normally
Lysosome
Controlled release of substances by cells or tissues
portals at the plasma membrane called porosomes. Porosomes are permanent cup-shaped lipoprotein structures embedded in the cell membrane, where secretory vesicles
Secretion
Study of cell activity
structure of the cell and help the cell move. There are different ways through which cells can transport substances across the cell membrane. The two main
Cell_physiology
Transportation of solutes through membranes
situated in cytoplasmic vesicles. The cell membrane regulates the transport of materials entering and exiting the cell. Thermodynamically the flow of substances
Membrane_transport
Thin, film-like structure separating two fluids, acting as a selective barrier
particles. Membranes can be generally classified into synthetic membranes and biological membranes. Biological membranes include cell membranes (outer coverings
Membrane
Any small, fluid-filled, spherical organelle enclosed by a membrane
membrane to release their contents outside the cell. Vesicles can also fuse with other organelles within the cell. A vesicle released from the cell is
Vesicle (biology and chemistry)
Vesicle_(biology_and_chemistry)
Medical condition
with increased red cell membrane surface area, such as pathologies of the liver and spleen which produce codocytes or "target cells" which have a central
Macrocytic_anemia
Process in multicellular organisms
at the front of a migrating cell is also the site at which membrane from internal membrane pools is returned to the cell surface at the end of the endocytic
Cell_migration
State of unresponsiveness to repeated stimuli
an organ or cell is incapable of repeating a particular action, or (more precisely) the amount of time it takes for an excitable membrane to be ready
Refractory period (physiology)
Refractory_period_(physiology)
Form of programmed cell death
Formation of membrane protrusions: Some cell types, under specific conditions, may develop different types of long, thin extensions of the cell membrane called
Apoptosis
Overview of and topical guide to cell biology
whose cells lack a membrane-bound cell nucleus, or any other membrane-bound organelles, including bacteria. Bacterial cells – A prokaryotic cell belonging
Outline_of_cell_biology
Concept and model of cell membrane structure
plasma membrane is a concept of cell membrane structure suggesting that the fluid plasma membrane is compartmentalized by actin-based membrane-skeleton
Fences and pickets model of plasma membrane structure
Fences_and_pickets_model_of_plasma_membrane_structure
alkaline anion-exchange membrane fuel cell (AAEMFC), also known as anion-exchange membrane fuel cells (AEMFCs), alkaline membrane fuel cells (AMFCs), hydroxide-exchange
Alkaline anion-exchange membrane fuel cell
Alkaline_anion-exchange_membrane_fuel_cell
Domain of organisms
fallen out of use. Archaeal cells have unique properties distinguishing them from Bacteria and Eukaryota, including: cell membranes made of ether-linked lipids;
Archaea
Vesicles released from the outer membranes of Gram-negative bacteria
made of LPS were derived from the outer membrane of the bacteria. OMVs mediate stress response, cell-to-cell communication, host colonization, and immune
Outer_membrane_vesicle
Class of lipids
component of all cell membranes. They can form lipid bilayers because of their amphiphilic characteristic. In eukaryotes, cell membranes also contain another
Phospholipid
Network of filamentous proteins that forms the internal framework of cells
cytoplasm of all cells, including those of bacteria and archaea. In eukaryotes, it extends from the cell nucleus to the cell membrane and is composed of
Cytoskeleton
Cell division into two identical cells
cytokinesis, which divide the cytoplasm, organelles, and cell membrane of one cell into two new cells containing roughly equal shares of these cellular components
Mitosis
Cellular structure shaped like a star
centrosome, but as they are bound to the cell membrane, this results in pulling the centrosomes towards the membrane, thus assisting cytokinesis. Astral microtubules
Aster_(cell_biology)
Chloroplast DNA that encode chloroplast proteins Membrane protein Integral membrane protein Peripheral membrane protein Extracellular matrix proteins Blood
List_of_proteins
Part of the immune system that enhances the ability of antibodies and phagocytic cells
and phagocytic cells to clear microbes and damaged cells from an organism, promote inflammation, and attack the pathogen's cell membrane. Despite being
Complement_system
Models for cell membranes
structure of a cell membrane or what its components were; biologists and other researchers used indirect evidence to identify membranes before they could
Membrane_models
Damaging changes to a biological cell
sickle cell anemia The most notable components of the cell that are targets of cell damage are the DNA and the cell membrane. DNA damage: In human cells, both
Cell_damage
Part of a cell's cytoplasm
cytoplasm in protists, that lies just beneath the cell membrane. In other eukaryotes it is known as the cell cortex. It contains actin filaments, allowing
Ectoplasm_(cell_biology)
Protein complex on the surface of T cells that recognizes antigens
forming antiparallel β-sheets. The Constant region is proximal to the cell membrane, followed by a transmembrane region and a short cytoplasmic tail, while
T-cell_receptor
Polar morphology of a cell, a specific orientation of the cell structure
digestive tract and circulatory system). These cells have an apical-basal polarity defined by the apical membrane facing the outside surface of the body, or
Cell_polarity
American cell and molecular biologist
known for co-developing the Fluid Mosaic Model of the cell membrane, a central concept in modern cell biology. Singer was born in New York City and attended
Seymour_Jonathan_Singer
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