Which system is involved in supplying the body with oxygen?

The respiratory system is the key system responsible for supplying the body with oxygen. This system includes organs such as the lungs, trachea, bronchi, and diaphragm, which work together to facilitate the inhalation of oxygen-rich air and the exhalation of carbon dioxide.

During respiration, air enters the lungs, where oxygen passes through the alveoli—tiny air sacs—into the bloodstream. Here, oxygen binds to hemoglobin in red blood cells, which then transport it to tissues and organs throughout the body. This process is essential for cellular respiration, where cells utilize oxygen to produce energy and carry out various metabolic functions.

While the excretory system focuses on waste removal, the nervous system manages and coordinates body functions, and the digestive system processes food for nutrients, none of these systems play a primary role in oxygen supply like the respiratory system. This highlights the specialized function of the respiratory system in ensuring that oxygen reaches the body's tissues, making it crucial for survival and overall health.