Hi Dear,

Blood is a body fluid in humans and other animals that  circulates through our body and delivers essential substances to the body's cells. Following are few major function of blood:

• Delivering oxygen from the lungs and nutrients from the digestive tract to all body cells.
• Transporting metabolic waste products from cells to elimination sites
• Transporting hormones from the endocrine organs to their target organs.
• Maintaining appropriate body temperature
• Maintaining normal pH in body tissues.

Good Luck