The elastic cartilage in the larynx functions to support the organ with enough elasticity. It allows the closing or folding of the laryngeal opening when you swallow. The elastic cartilage has chondrocyte cells and many elastic fibers in its amorphous extracellular matrix. It provides strength and elasticity to the organ.

The ciliated pseudostratified columnar epithelium found in the bronchi provides protection to the lungs from foreign substances which may cause irritation. The goblet cells found in the epithelium traps these substances by secreting mucus. The cilia also helps in the movement and transportation of the particles from the nasal cavity. Thus, the tissue helps in producing mucus and keep the respiratory tract clean and unobstructed.

The smooth muscle in the trachea is more specifically called airway smooth muscle (ASM). This is responsible for controlling the amount of air that goes through the trachea and lungs. It moves involuntarily and is controlled by the autonomic nervous system.