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What system of the human body supplies the body with oxygen?
Circulatory system
Respiratory system
Nervous system
Digestive system
The correct answer is: Respiratory system
The respiratory system is responsible for supplying the body with oxygen. It facilitates the process of inhalation, where air containing oxygen is drawn into the lungs. Once inside the lungs, the oxygen is transferred to the bloodstream through the alveoli, small air sacs where gas exchange occurs. This oxygen-rich blood is then circulated throughout the body by the circulatory system, delivering oxygen to cells for energy production and other vital functions. While the circulatory system plays a crucial role in transporting oxygen throughout the body, it is the respiratory system that is specifically responsible for the intake of oxygen from the environment. The nervous system is involved in regulating various body functions, including breathing, but does not partake in the direct supply of oxygen. Similarly, the digestive system processes food for energy and nutrients, but does not contribute to breathing or oxygen supply. Therefore, the correct answer highlights the primary function of the respiratory system in oxygen acquisition.