Blood is a vital liquid connective tissue in the human body that circulates throughout the body via the circulatory system. It is composed of several different types of cells, including red blood cells (also known as erythrocytes), white blood cells (also known as leukocytes), and platelets (also known as thrombocytes), as well as plasma, which is the liquid portion of blood.
The primary function of blood is to transport oxygen, nutrients, hormones, and waste products to and from the body’s tissues and organs. Red blood cells contain a protein called hemoglobin, which binds to oxygen in the lungs and transports it to the body’s tissues. White blood cells play a critical role in the immune system, defending the body against infections and diseases. Platelets are responsible for blood clotting, which is important to stop bleeding when blood vessels are damaged.
Blood is also important in maintaining homeostasis, the balance of internal conditions in the body, such as body temperature, pH, and electrolyte balance. Overall, blood is an essential component of the human body, and any disruptions or disorders affecting its composition or function can have significant health consequences.