What organs are primarily involved in the respiratory system?

The primary organs involved in the respiratory system are the nose, bronchi, and lungs. The nose acts as the entry point for air, where it is filtered, warmed, and moistened before it travels down the trachea. From the trachea, air passes into the bronchi, which are the main passages that direct air into each lung. The lungs themselves are vital organs where gas exchange occurs; they allow oxygen to enter the bloodstream and carbon dioxide to be expelled from the body.

The other choices refer to organs that are involved in different systems of the body. The heart and blood vessels are part of the circulatory system, responsible for pumping blood and transporting nutrients and oxygen. The kidneys and bladder are part of the urinary system, playing crucial roles in waste filtration and fluid balance. The stomach and intestines are components of the digestive system, responsible for breaking down food and absorbing nutrients. Thus, identifying the nose, bronchi, and lungs as the primary organs in the respiratory system correctly reflects their essential functions in the process of breathing and gas exchange.