Question

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How do organs in the respiratory system work together to allow a fish to take oxygen into its body?
A. Blood enters the heart through blood vessels, where muscles absorb oxygen. B. Water passes over the gills, where oxygen enters tiny blood vessels.
C. Air enters the windpipe through the alveoli, where the filaments take in oxygen.
D. Lymph enters the lymph nodes, where oxygen is absorbed by the blood. ​

Answer 1

B. Water passes over the gills, where oxygen enters tiny blood vessels.

• Fish take water into their mouth, passing the gills just behind its head on each side.

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