Interstitial fluid

Definition

Interstitial fluid is the liquid found between cells in tissues, providing a medium for nutrients and waste to be exchanged. It plays a crucial role in maintaining the internal environment of tissues.

5 Must Know Facts For Your Next Test

1. Interstitial fluid makes up about 16% of an adult human's body weight.
2. It is derived from blood plasma but lacks most of the proteins found in plasma.
3. Interstitial fluid helps transport nutrients, oxygen, and waste products between blood and cells.
4. The composition of interstitial fluid can affect cellular function and signaling.
5. Lymph eventually returns interstitial fluid to the circulatory system.

Review Questions

• What percentage of an adult human's body weight is made up by interstitial fluid?
• How does interstitial fluid differ from blood plasma?
• Explain the role of interstitial fluid in nutrient and waste exchange.

Related terms

Blood Plasma: The liquid component of blood that carries cells and proteins throughout the body.

Lymphatic System: A network of tissues and organs that help rid the body of toxins and waste through lymph.

Extracellular Matrix: A complex network of proteins and carbohydrates surrounding cells, providing structural support.