What are the main functions of blood in the human body?

Here are the functions of blood: Transport of Gases: Blood transports oxygen from the lungs to all body tissues and carries carbon dioxide*, a waste product, from the tissues back to the lungs for exhalation. This is primarily done by hemoglobin in red blood cells. Transport of Nutrients: It delivers absorbed nutrients* like glucose, amino acids, fatty acids, vitamins, and minerals from the digestive tract to cells throughout the body for energy, growth, and repair. Transport of Hormones: Blood acts as a medium for transporting hormones* secreted by endocrine glands to their target organs, regulating various physiological processes. Transport of Waste Products: Metabolic waste products such as urea, uric acid, and creatinine* are transported by blood from the tissues to the kidneys for excretion. Regulation of Body Temperature: Blood helps regulate body temperature by distributing heat generated by metabolic activity throughout the body and by carrying heat to the skin for dissipation. Regulation of pH: Blood contains buffer systems* (e.g., bicarbonate buffer system) that help maintain the body's pH within a narrow, physiological range (7.35-7.45). Regulation of Fluid and Electrolyte Balance: Blood plasma contributes to maintaining the osmotic pressure and fluid balance* between blood and interstitial fluid, as well as distributing electrolytes. Protection Against Infection: White blood cells (leukocytes) and antibodies* (immunoglobulins) in the blood are crucial components of the immune system, defending the body against pathogens, foreign substances, and diseased cells. Protection Against Blood Loss: Platelets and clotting factors* in the blood initiate the process of hemostasis, forming blood clots to prevent excessive blood loss from injured vessels. 3 done, 2 left today. You're making progress.