Day: April 9, 2026

Lower Respiratory Tract Larynx (voice box): Routes air and food into proper channels; contains vocal cords for sound production. Trachea (windpipe): Flexible tube conducting air to the bronchi; reinforced by C-shaped cartilage rings. Bronchial tree: Branching system of airways leading from the trachea to the alveoli. Alveoli: Microscopic air sacs where gas exchange occurs. Lungs: Paired organs …