👉 The sixth fluid, often referred to as the interstitial fluid or extracellular fluid, is a vital component of biological systems, particularly in animals. This fluid fills the spaces between cells and within tissues, playing a crucial role in nutrient transport, waste removal, and maintaining cellular homeostasis. Unlike blood, which circulates through the vascular system, interstitial fluid is directly involved in cellular metabolism and communication. It facilitates the exchange of gases, nutrients, and metabolic waste products between blood vessels and cells, ensuring that cells receive the necessary substances for survival and function while efficiently removing waste. This fluid is essential for maintaining the structural integrity of tissues and supporting overall physiological processes.
