Inhalation, Breathing in, Exhalation, Breathing out, 2 functions of the Respiratory System, Take in Oxygen from the atmosphere and Give out Carbon Dioxide and Water Vapour to the atmosphere, The gas we breathe in from the atmosphere, Oxygen, The two substances that we breath out to the atmosphere, Carbon dioxide and water vapour, Air enters the respiratory system through here, Mouth and nose, What happens when air is inhaled through the nose?, It is warmed and moistened to make it easier for gases to be exchanged. Hairs and mucus clean this air by removing dust and micro-organisms., Flap of tissue that stops food from entering the trachea, Epiglottis, Also known as the wind-pipe. It is made from c-shaped rings of cartilage that keep it open., Trachea, The trachea divides into two…, Bronchi, Two large, spongy and elastic organs in the chest. Expand during inhalation and contract during exhalation, The Lungs, Each bronchus divides into narrow tubes in the lungs. These are called…, Bronchioles, Tiny air sacs found at the end of each bronchiole, Alveolus, Gas exchange happens here, Alveolus, Alveoli are surrounded by tiny blood vessels that are 1 cell thick. These are called…, Capillaries, During gas exchange, oxygen moves from the alveoli to the…, Capillaries, During gas exchange, carbon dioxide and water moves from the capillaries to the…., Alveoli, Alveoli provide a large ______________ for gas exchange, Surface Area, This process allows each gas to move from an area of high concentration to an area of low concentration, Diffusion, A large sheet of muscle below the lungs at the bottom of the ribcage, Diaphragm, These muscles move the ribs during inhalation and exhalation, Intercostal muscles

Respiratory System

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