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Caption: Inhalation brings the outside air into the lungs. It is caused by the contraction of the respiratory muscles (diaphragm, intercostal muscles), which expand the rib cage and increase the pulmonary volume.
Credit: Album / Universal Images Group
Image size: 2223 × 2520 px | 16.0 MB
Print size: 18.8 × 21.3 cm | 875.2 × 992.1 in (300 dpi)