BO VEISLAND, MI&I / SCIENCE PHOTO LIBRARY BO VEISLAND, MI&I / SCIENCE PHOTO LIBRARY
Respiratory system. Illustration of the human respiratory system showing the lungs, diaphragm, and heart. At top the sectioned head shows the brain (grey and yellow) where respiration is controlled. Bone is speckled white. Leading down from the mouth is the trachea (blue). Air comes down the trachea and through the bronchi (blue, branching) into the lungs (pink). Beneath the lungs the downward contraction (arrows) of the muscular diaphragm (pink) makes the lungs fill. Between the lungs is the heart (red). Deoxygenated blood returning to the heart is shown in the blue vessels at left (vena cava) and right (pulmonary artery). The main artery (aorta) is in red.
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