PETER GARDINER / SCIENCE PHOTO LIBRARY PETER GARDINER / SCIENCE PHOTO LIBRARY
Mechanics of respiration. Cutaway diagrams showing the mechanics of breathing in (left) and breathing out (right). Arrows show: the movement of air in and out of the nose, mouth and trachea; the expansion and contraction of the rib cage and the abdomen; and the contraction and relaxation of the diaphragm (the sheet of muscle between the chest and the abdomen).
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