Which organ system is composed of the heart and blood vessels?

Question

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The circulatory system is composed of the heart and blood vessels, and it is responsible for transporting oxygen, nutrients, hormones, and waste products throughout the body. The muscular system (A) includes the skeletal muscles and is responsible for movement, while the skeletal system (B) includes bones and provides structural support. The respiratory system (D) includes the lungs and is responsible for exchanging oxygen and carbon dioxide.

Which Organ System Is Composed of the Heart and Blood