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Intracellular
 
 
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Not to be confused with intercellular, meaning "between cells".

In cell biology
Cell biology

Cell biology is an list of academic disciplines that studies cell s ? their physiology properties, their structure, the organelles they contain, interactions with their environment, their cell cycle, cell division and apoptosis....
, molecular biology
Molecular biology

Molecular biology is the study of biology at a molecule level. The field overlaps with other areas of biology and chemistry, particularly genetics and biochemistry....
 and related fields, the word intracellular means "inside the cell
Cell (biology)

The cell is the structural and functional unit of all known Life organisms. It is the smallest unit of an organism that is classified as living, and is often called the building bricks of life....
".

It is used in contrast to extracellular
Extracellular

In cell biology, molecular biology and related fields, the word extracellular means "outside the cell ". This space is usually taken to be outside the plasma membranes, and occupied by fluid....
 (outside the cell). The cell membrane
Cell membrane

The cell membrane is the interface between the cellular machinery inside the cell and the fluid outside.It is a semipermeable lipid bilayer found in all cell ....
 (and, in plants, the cell wall
Cell wall

A cell wall is a tough, flexible and sometimes fairly rigid layer that surrounds some types of cell . It is located outside the cell membrane and provides these cells with structural support and protection, and also acts as a filtering mechanism....
) is the barrier between the two, and chemical composition of intra- and extracellular milieu can be radically different. In most organisms, for example, a Na+/K+ ATPase
ATPase

ATPases are a class of enzymes that catalysis the decomposition of adenosine triphosphate into adenosine diphosphate and a free phosphate ion....
 maintains a high potassium
Potassium

Potassium is a chemical element. It has the symbol K , atomic number 19, and atomic mass 39.0983. Potassium was first isolated from potash, hence the name....
 level inside cells while keeping sodium
Sodium

Sodium is an element which has the symbol Na , atomic number 11, atomic mass 23 amu , and a common oxidation number +1. Sodium is a soft, silvery white, highly reactive element and is a member of the alkali metals within "group 1" ....
 low, leading to chemical excitability.






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Not to be confused with intercellular, meaning "between cells".

In cell biology
Cell biology

Cell biology is an list of academic disciplines that studies cell s ? their physiology properties, their structure, the organelles they contain, interactions with their environment, their cell cycle, cell division and apoptosis....
, molecular biology
Molecular biology

Molecular biology is the study of biology at a molecule level. The field overlaps with other areas of biology and chemistry, particularly genetics and biochemistry....
 and related fields, the word intracellular means "inside the cell
Cell (biology)

The cell is the structural and functional unit of all known Life organisms. It is the smallest unit of an organism that is classified as living, and is often called the building bricks of life....
".

It is used in contrast to extracellular
Extracellular

In cell biology, molecular biology and related fields, the word extracellular means "outside the cell ". This space is usually taken to be outside the plasma membranes, and occupied by fluid....
 (outside the cell). The cell membrane
Cell membrane

The cell membrane is the interface between the cellular machinery inside the cell and the fluid outside.It is a semipermeable lipid bilayer found in all cell ....
 (and, in plants, the cell wall
Cell wall

A cell wall is a tough, flexible and sometimes fairly rigid layer that surrounds some types of cell . It is located outside the cell membrane and provides these cells with structural support and protection, and also acts as a filtering mechanism....
) is the barrier between the two, and chemical composition of intra- and extracellular milieu can be radically different. In most organisms, for example, a Na+/K+ ATPase
ATPase

ATPases are a class of enzymes that catalysis the decomposition of adenosine triphosphate into adenosine diphosphate and a free phosphate ion....
 maintains a high potassium
Potassium

Potassium is a chemical element. It has the symbol K , atomic number 19, and atomic mass 39.0983. Potassium was first isolated from potash, hence the name....
 level inside cells while keeping sodium
Sodium

Sodium is an element which has the symbol Na , atomic number 11, atomic mass 23 amu , and a common oxidation number +1. Sodium is a soft, silvery white, highly reactive element and is a member of the alkali metals within "group 1" ....
 low, leading to chemical excitability.