Which body system supplies the body with oxygen through breathing?

The respiratory system is directly responsible for supplying the body with oxygen through the process of breathing. When you inhale, air enters the lungs where oxygen is exchanged for carbon dioxide in the alveoli, tiny air sacs within the lungs. This oxygen is essential for cellular respiration, a process that produces energy in the body.

The respiratory system works in tandem with the circulatory system, which transports the oxygenated blood throughout the body to deliver oxygen to cells and tissues. However, it is the respiratory system that initiates the oxygen intake process. The other body systems mentioned—such as the endocrine and digestive systems—serve different functions, focusing on hormone regulation and nutrient processing, respectively, rather than the exchange and supply of oxygen.