What are three major functions of circulatory system?

1. Transportation of gases. The circulatory system transports oxygen from the lungs to the body's tissues and carbon dioxide from the tissues to the lungs.

2. Transportation of nutrients. The circulatory system transports nutrients from the digestive tract to the body's tissues.

3. Transportation of hormones. The circulatory system transports hormones from the endocrine glands to the body's targets.