👉 A common fluid is typically a substance that exists in a liquid state within living organisms or natural environments, serving various essential functions. Examples include blood, which transports oxygen and nutrients; synovial fluid, which lubricates joints; and cerebrospinal fluid, which cushions the brain and spinal cord. These fluids are vital for maintaining homeostasis, facilitating biochemical reactions, and protecting internal structures. They play crucial roles in digestion, circulation, and overall bodily health.
