👉 Fluids, in the broadest sense, refer to any substances that are in a liquid state and play crucial roles in biological systems. These include water, which is the most abundant fluid in the human body, essential for maintaining cellular function, regulating temperature, and facilitating biochemical reactions. Other key fluids are blood, a complex fluid composed of plasma and cells that transports oxygen, nutrients, hormones, and waste products; synovial fluid, which lubricates joints and reduces friction during movement; and digestive fluids like saliva, gastric juices, and bile, which aid in breaking down food and absorbing nutrients. Each fluid has unique properties and functions that are vital for sustaining life, from maintaining homeostasis to supporting metabolic processes.
