Final answer:
The circulatory system includes the heart, blood vessels, and blood as its main components, which transport materials to and from all cells of the body.
Explanation:
Circulatory system: The circulatory system is an organ system that transports materials to and from all the cells of the body. It includes the heart, blood vessels, and blood.
Organs of the circulatory system:
- Heart: Acts as the pump circulating the blood.
- Arteries: Carry oxygen-rich blood away from the heart to the body.
- Veins: Return oxygen-poor blood back to the heart.
- Capillaries: Small blood vessels where exchange of nutrients and waste occurs with body tissues.
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