Light micrograph of the lung of a rat foetus. During lung development, the conducting airways are formed first, followed by the formation and enlargement of the gas exchange area. The micrograph shows developing bronchi and bronchioles, but alveoli have not yet formed. At top, the ribs still are in cartilaginous phase.

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TOP29728579

Source:

達志影像

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RM

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須由TPG 完整授權

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