The circulatory system consists of the heart, blood vessels, and blood, working together to transport oxygen, nutrients, hormones, and waste products throughout the body. The heart pumps oxygen-rich blood from the lungs to the tissues and organs while returning oxygen-poor blood to the lungs for reoxygenation. Meanwhile, the respiratory system, which includes the lungs, trachea, and diaphragm, facilitates gas exchange by bringing oxygen into the body and expelling carbon dioxide. Together, these systems ensure that cells receive the oxygen they need for metabolism while removing carbon dioxide, thus maintaining homeostasis and overall health.
In 3-5 complete sentences describe 2 human body systems - the organs and how they work together in the human body
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