Which statement about structures in the respiratory tract is FALSE?

The statement that content aspirated would likely enter the left bronchus is incorrect because the anatomy of the bronchi favors the right bronchus for aspiration. The right bronchus is wider, shorter, and more vertically oriented compared to the left bronchus. This anatomical orientation means that when foreign materials are inhaled, they are more likely to travel into the right bronchus rather than the left.

The other statements detail accurate anatomical features and classifications within the respiratory tract. The trachea indeed contains cartilaginous rings that provide structural support and keep it open. The bronchi are part of the conducting division, which is responsible for transporting air to the lungs but does not participate in gas exchange. Similarly, the pharynx is also part of the conducting division, serving as a pathway for air to enter the lower respiratory tract. Each of these features is correctly identified in their respective statements.