The respiratory system is a group of organs and tissues that work together to help us breathe. It includes the nose, trachea, lungs, and diaphragm. When we inhale, air enters through the nose or mouth, travels down the trachea, and fills the lungs, where oxygen is exchanged for carbon dioxide in the blood. The primary function of the respiratory system is to supply oxygen to the body and remove carbon dioxide, a waste product of metabolism. This process is essential for maintaining the body's energy levels and overall health. Proper functioning of the respiratory system is crucial for activities like exercise and daily living.