trachea - The tube through which air travels from the mouth and nose to the lungs. Also known as the windpipe., bronchi (singular: bronchus) - The two tubes that lead from the trachea into the lungs., bronchioles (singular: bronchiole) - Small tubes that lead from the bronchi to the alveoli., alveoli (singular: alveolus) - Tiny air sacs arranged in clusters throughout the lungs. They provide a large surface area for gas exchange to take place., intercostal muscles - Muscles found between the ribs. They contract to help move air into and out of the lungs., diaphragm - A dome-shaped, flat muscle that sits underneath the ribcage. It contracts to change the volume of the chest, causing the movement of air into and out of the lungs., ribs - The bones that protect the organs in the chest., lungs - A pair of organs through which air is moved in and out when we breathe.,

CiGCSE Function of structure in the human gaseous exchange system

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