- Transport
- Temperature Regulation
- Protection
Transport
The circulatory system:
- Transports gases to and from the respiratory system.
- Transports nutrients and water from the digestive system around the body.
- Transports wastes from the body to the liver, kidneys, skin and lungs for removal.
- Transports other chemicals such as hormones around the body.
Temperature Regulation
- As blood moves around the body, heat is transferred between different organs.
Protection
- Fights against disease-causing microbes or harmful substances introduced into the body.
- Protects against blood loss from injury.