Lungs+ gas exchange

• all cells need cellular respiration to release energy
• oxygen combines with carbon to form carbon dioxide and generate energy
• what are the 4 parts of the lungs?

  trachea / bronchi / bronchioles / alveoli
• the organ system is part of the respiratory system
• alveolus is a single alveoli
• the tiny air sacks in lungs are called alveoli
• diffusion is the process where oxygen moves through alveoli wall into the blood
• alveoli walls are once cell thick providing short distance for diffusion
• the alveoli walls are moist allowing gasses to dissolve
• carbon dioxide is transported around the body and dissolves in the plasma