4-Zoology-Kinds-Chordate-Gill

gill of chordate

Stem chordates have external respiration {gill, chordate}|, allowing efficient oxygen uptake into blood and carbon-dioxide removal from blood.

gill slit

Body-side openings {gill slit}| allow water to flow into mouth and through gills, for better respiration.

external respiration

Gills allow blood and water to exchange oxygen and carbon dioxide {external respiration} efficiently.

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Date Modified: 2022.0225