Respiratory tree

(Zool.)

the branched internal gill of certain holothurians.

respiratory tree

[′res·prə‚tor·ē ‚trē] (anatomy) The trachea, bronchi, and bronchioles. (invertebrate zoology) Either of a pair of branched tubular appendages of the cloaca in certain holothurians that is thought to have a respiratory function.

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