Extracellular

Jump to: navigation, search

WikiDoc Resources for Extracellular

Articles

Most recent articles on Extracellular

Most cited articles on Extracellular

Review articles on Extracellular

Articles on Extracellular in N Eng J Med, Lancet, BMJ

Media

Powerpoint slides on Extracellular

Images of Extracellular

Photos of Extracellular

Podcasts & MP3s on Extracellular

Videos on Extracellular

Evidence Based Medicine

Cochrane Collaboration on Extracellular

Bandolier on Extracellular

TRIP on Extracellular

Clinical Trials

Ongoing Trials on Extracellular at Clinical Trials.gov

Trial results on Extracellular

Clinical Trials on Extracellular at Google

Guidelines / Policies / Govt

US National Guidelines Clearinghouse on Extracellular

NICE Guidance on Extracellular

NHS PRODIGY Guidance

FDA on Extracellular

CDC on Extracellular

Books

Books on Extracellular

News

Extracellular in the news

Be alerted to news on Extracellular

News trends on Extracellular

Commentary

Blogs on Extracellular

Definitions

Definitions of Extracellular

Patient Resources / Community

Patient resources on Extracellular

Discussion groups on Extracellular

Patient Handouts on Extracellular

Directions to Hospitals Treating Extracellular

Risk calculators and risk factors for Extracellular

Healthcare Provider Resources

Symptoms of Extracellular

Causes & Risk Factors for Extracellular

Diagnostic studies for Extracellular

Treatment of Extracellular

Continuing Medical Education (CME)

CME Programs on Extracellular

International

Extracellular en Espanol

Extracellular en Francais

Business

Extracellular in the Marketplace

Patents on Extracellular

Experimental / Informatics

List of terms related to Extracellular


Overview

In cell biology, molecular biology and related fields, the word extracellular (or sometimes extracellular space) means "outside the cell". This space is usually taken to be outside the plasma membranes, and occupied by fluid. The term is used in contrast to intracellular (inside the cell).

The cell membrane (and, in plants, the cell wall) 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 pump maintains a high sodium level outside cells while keeping potassium low, leading to chemical excitability.

The composition of the extracellular space includes metabolites, ions, proteins, and many other substances that might affect cellular function. For example, neurotransmitters "jump" from cell to cell to facilitate the transmission of an electric current in the nervous system. Hormones also act by travelling the extracellular space towards cell receptors. Other proteins that are active outside the cell are the digestive enzymes.

The term 'extracellular' is often used in reference to the extracellular fluid (ECF) which composes about 15 litres of the average human body.

cs:Mezibuněčný prostor de:Extrazellularraum



Linked-in.jpg