👉 Fluid, in the context of biological systems, refers to the dynamic and continuous exchange of substances between cells and their environment. This includes water, ions, nutrients, and waste products, which are transported through various cellular compartments and across cell membranes via specialized transport mechanisms. The fluidity of this exchange is crucial for maintaining cellular homeostasis, enabling processes like nutrient uptake, waste removal, and signaling. In tissues, the fluid nature of this exchange ensures that cells can efficiently interact with their surroundings, supporting overall physiological functions and adaptability. This constant movement and interaction of fluid within cells and tissues underpin the complex biological processes essential for life.
