👉 The remarkable fluid within living organisms, known as blood, is a complex and dynamic mixture that plays a crucial role in sustaining life. Composed primarily of water, it also contains red and white blood cells, platelets, proteins, and various dissolved substances. This fluid acts as a transport system, carrying oxygen from the lungs to tissues throughout the body and delivering nutrients while removing waste products. Its viscosity, or thickness, is finely regulated to ensure efficient circulation, and it can adapt to different physiological demands, such as during exercise or in response to injury. Blood's fluid nature allows it to flow smoothly through the intricate network of blood vessels, making it an indispensable component of the circulatory system that keeps every cell functioning optimally.
