👉 Fluid, in the context of biological systems, refers to the various substances that circulate within an organism's body, playing crucial roles in maintaining homeostasis and facilitating essential physiological processes. This includes blood, which is a specialized type of fluid composed primarily of water, red and white blood cells, platelets, and various proteins and nutrients; lymph, a clear fluid that circulates through the lymphatic system, aiding in immune function and the absorption of fats; and cerebrospinal fluid (CSF), which protects and nourishes the brain and spinal cord. Each type of fluid serves unique functions, contributing to overall bodily health and homeostasis by transporting oxygen, nutrients, hormones, waste products, and immune cells throughout the body.
