alveoli - Tiny air sacs in a lung where gas exchange occurs. Alveoli are like tiny balloons with thin walls that allow efficient gas exchange with the blood., breathing - The process used by animals to exchange gases with the atmosphere. Breathing allows animals to take in oxygen and get rid of waste carbon dioxide. , Bronchiole - A tube that carries air through a lung. Bronchioles branch out from the trachea like tree roots and carry air to and from the alveoli., capillary - A tiny blood vessel where substances pass to and from the blood. Capillaries line the walls of alveoli, carrying carbon dioxide to the lungs and taking away oxygen. , carbon dioxide - A gas produced as waste when cells release energy, cellular respiration - The process used by all living cells to release energy. Oxygen + Glucose -> Energy + Carbon Dioxide + Water, diaphragm - A large sheet of muscle that contracts to draw gas into the lungs, diffusion - The movement of molecules from an area of high to low concentration. Gases diffuse between the air in the lungs and the bloodstream, through the walls of alveoli. , epiglottis - A flap of cartilage that stops food entering the trachea, gas exchange - The movement of oxygen into the blood and carbon dioxide out of it, larynx - The upper part of the trachea, containing the vocal cords (voice box), lung - An organ where gas exchange occurs between air and blood, nostril - An opening in the nose where incoming air is warmed and filtered, oxygen - A gas needed by cells to release energy. Oxygen is breathed in to the lungs and transferred to the bloodstream, which carries it to cells., pharynx - The common pathway for air and food.The pharynx is located at the back of the throat., trachea - The main airway between the throat and the lungs (windpipe) ,

Respiratory System

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