Lungs

• what happens when you breathe


  oxygen enters your bloodstream for respiration and carbon dioxide exits.
• The air you breathe in goes through the trachea which splits into two tubes called bronchi - one going into each long the lung. bronchi splits into smaller tubes called bronchioles which finally end up in small bags called alveoli
• alveoli carry out gas exchange in the body
• the walls of the alveoli are very thin so oxygen can diffuse easily from the air to the bloodstream.
• carbon dioxide is produced by cells during cellular respiration, it then moves across the wall of the alveolus into the lungs where it is breathed out as part of exhaling
• when we exercise our breathing rate increases because more oxygen is needed for aerobic respiration
• alveoli process