External respiratory exchange in most annelids is accomplished by

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External respiratory exchange in most annelids is accomplished by diffusion. These organisms have a moist epidermis that allows for respiratory gases to diffuse in and out of their body. Some annelids also have additional respiratory structures, such as gills or parapodia, which increase the surface area available for gas exchange. Ventilation, active transport, and endocytosis are not typically used in annelid respiration. Facilitated diffusion may play a minor role in some annelids, but overall, diffusion is the primary mechanism.

External Respiratory Exchange in Most Annelids Is Accomplished by