👉 Fluids, also known as bodily fluids, are essential substances that circulate through the body to maintain homeostasis and support various physiological functions. These include water, blood (which is a mix of plasma and red and white blood cells), lymph, mucus, sweat, and various secretions. Water is the most abundant fluid, making up about 60% of an adult's body weight, and it is crucial for regulating body temperature, transporting nutrients, and flushing out waste. Blood, a key component of the fluid system, carries oxygen, nutrients, hormones, and immune cells throughout the body. Lymph, a clear fluid with proteins and white blood cells, helps remove toxins and waste from tissues. Mucus lines the respiratory, digestive, and reproductive tracts, trapping harmful particles and pathogens. Sweat and other secretions help regulate body temperature and remove waste products. Together, these fluids ensure that the body functions optimally by maintaining balance and supporting essential processes.