Bronchi

Bronchi are large air passages within the lungs that branch off from the trachea (windpipe). They serve as the main pathways through which air is directed into each lung. Once inside the lungs, the bronchi subdivide into smaller tubes called bronchioles, distributing air to the microscopic air sacs (alveoli) where oxygen exchange occurs. The bronchi are lined with mucous membranes and tiny hair-like structures called cilia, which help trap particles and clear mucus. Their primary function is to efficiently conduct air, ensuring oxygen reaches the bloodstream and carbon dioxide is expelled during respiration.