Which body system keeps blood supplied with oxygen and removes carbon dioxide from the lungs?

The body system responsible for supplying blood with oxygen and removing carbon dioxide from the lungs is the respiratory system. This system facilitates the exchange of gases through various structures such as the nasal cavity, trachea, bronchi, and lungs.

When air is inhaled, oxygen enters the alveoli (tiny air sacs in the lungs), where it diffuses into the surrounding capillaries and binds to hemoglobin in red blood cells. Simultaneously, carbon dioxide, produced as a waste product by the body's cells, is transported back to the lungs via the bloodstream to be exhaled.

This vital process not only maintains the necessary oxygen levels in the bloodstream for cellular respiration but also plays an essential role in regulating blood pH by controlling carbon dioxide levels. Thus, the respiratory system is integral to sustaining life and ensuring proper cellular function.