Gas exchange, The process by which oxygen diffuses into the the blood and carbon dioxide diffuses out at the alveoli., Thorax, The part of the body containing the lungs and heart, protected by the ribs., Nasal cavity, The space inside the nose where incoming air is warmed, moistened and filtered., Larynx, The structure at the top of the trachea that contains the vocal cords., Trachea, An airway supported by rings of cartilage that carries air towards the lungs., Bronchus, One of the two main airways that branches from the trachea and enters a lung., Bronchioles, Small branching airways inside the lungs that lead towards the air sacs., Alveoli, Tiny air sacs with thin walls and a large surface area for diffusion., Rib, A curved bone that protects the lungs and moves during breathing., Intercostal muscle, Muscles between the ribs that help move the rib cage during breathing., Diaphragm, A sheet of muscle below the lungs that flattens when it contracts during inhalation.

Respiratory system structures

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