👉 A fluid, in the context of biology and physiology, refers to a substance that flows or moves freely, typically in response to external forces like gravity or pressure. This essential component is crucial for various bodily functions, including circulation, nutrient transport, and waste removal. For instance, blood, a type of fluid, circulates throughout the body, delivering oxygen and nutrients to cells while removing carbon dioxide and other waste products. Other examples include synovial fluid in joints, which lubricates and cushions them, and mucus in the respiratory and digestive tracts, which traps particles and pathogens. Understanding fluids is vital for comprehending how the body maintains homeostasis and performs its complex processes efficiently.
