Select one body system that you learned about in the video and explain how it works with the circulatory system.

One body system that is closely related to the circulatory system is the respiratory system.

The respiratory system is responsible for the exchange of gases—specifically, the intake of oxygen and the removal of carbon dioxide. This process begins when we inhale air into our lungs, where oxygen is transferred from the air into the bloodstream, and carbon dioxide flows from the blood into the lungs to be exhaled.

Once the oxygen enters the alveoli (tiny air sacs in the lungs), it diffuses across the walls into the capillaries, which are small blood vessels that are part of the circulatory system. Oxygen binds to hemoglobin molecules in red blood cells, allowing it to be transported throughout the body via the circulatory system.

As the heart pumps blood, it moves the oxygen-rich blood from the lungs through the pulmonary veins to the left atrium, then to the left ventricle, and out to the body through the aorta. At the same time, carbon dioxide, which is produced by the body's cells during metabolism, is carried back to the lungs via the circulatory system through the venous return. This blood returns to the right side of the heart and is pumped to the lungs via the pulmonary arteries, where carbon dioxide is expelled and the cycle begins anew.

In summary, the respiratory and circulatory systems work together to ensure that oxygen is delivered to tissues throughout the body and that carbon dioxide is removed efficiently, which is crucial for maintaining cellular function and overall health.