The respiratory system is a group of organs and tissues that work together to help us breathe. It includes the nose, throat, lungs, and airways. When we inhale, air enters through the nose or mouth, travels down the throat, and into the lungs, where oxygen is exchanged for carbon dioxide. 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 life, as oxygen is needed for the body's cells to produce energy.