Which organ system includes the heart and blood vessels?

The correct answer is the circulatory system, which is responsible for transporting blood, nutrients, gases, and waste products throughout the body. The heart plays a crucial role as it pumps blood, while the blood vessels, which include arteries, veins, and capillaries, form a network that carries this blood to and from various parts of the body. This system is vital for maintaining homeostasis, delivering oxygen and nutrients to tissues, and removing waste products. Understanding the circulatory system is essential for comprehending how the body sustains itself and responds to various physiological needs.