The main function of blood is to transport essential materials like water, nutrients, hormones, and oxygen to the tissues. It also transports waste substances like urea, carbon dioxide, etc. to the site of excretion.

Other functions of blood include

• Protection: It (White Blood Cells) protects the body by fighting against germs and toxic materials. Fibrinogen and prothrombin proteins present in platelets and plasma help in blood clotting.
• Regulation: It maintains body temperature and balances the amount of water to a constant level. It also regulates different chemicals like salt, sodium, potassium, calcium, acidity, alkalinity, etc.