What is the fluid between cells?
The fluid between cells is called interstitial fluid. This fluid, also known as tissue fluid, surrounds all cells in the body and is a vital component of the extracellular fluid (ECF).
Interstitial fluid originates from substances that leak out of blood capillaries, the body's smallest blood vessels. Its primary function is to facilitate the exchange of materials between blood and cells. This means it delivers essential nutrients like oxygen and transports waste products away from cells.
- Nutrient Delivery: Interstitial fluid acts as a conduit, carrying oxygen and nutrients from the blood to cells.
- Waste Removal: It efficiently removes metabolic waste products from cells, ensuring proper cellular function.
Several reputable sources confirm this:
- National Cancer Institute (NCI): Defines interstitial fluid as "Fluid found in the spaces around cells. It comes from substances that leak out of blood capillaries (the smallest type of blood vessel)." https://www.cancer.gov/publications/dictionaries/cancer-terms/def/interstitial-fluid
- StatPearls: States that "The interstitial fluid, the fluid between cells, is derived from..." https://www.ncbi.nlm.nih.gov/books/NBK537065/
- Study.com: Clearly states that "The fluid located between the cells is called Interstitial fluid (IF) or tissue fluid." https://homework.study.com/explanation/what-is-the-fluid-located-between-cells-called.html
Interstitial Fluid and Extracellular Fluid
It's important to note that interstitial fluid is a major component of the body's extracellular fluid (ECF). ECF also includes plasma, the fluid component of blood. Both interstitial fluid and plasma contribute to the overall fluid balance in the body, maintaining a stable internal environment for cells to thrive.
Clinical Significance
Monitoring interstitial fluid can provide valuable insights into a person's health. Changes in its composition can indicate various health problems. For example, abnormal fluid buildup in the interstitial space can lead to edema.
