Which system of the human body is responsible for supplying oxygen?

The respiratory system is responsible for supplying oxygen to the body. It includes the organs and structures that facilitate the exchange of gases, primarily oxygen and carbon dioxide. Through inhalation, the respiratory system allows air to enter the lungs, where oxygen diffuses into the bloodstream. This oxygen-rich blood is then transported throughout the body to fuel cellular processes.

While the cardiovascular system plays a critical role in transporting this oxygenated blood to various tissues and organs, it does not perform the initial process of oxygen intake from the environment. The digestive system is primarily concerned with breaking down food for nutrient absorption, and the nervous system is involved in coordinating bodily functions and responses but does not directly supply oxygen. Thus, understanding the specific roles of these systems clarifies the vital function of the respiratory system in oxygen supply.