Fish Gills: Respiratory Organs, Not Digestive
Gills are exclusively respiratory. They extract dissolved O2 from water and release CO2 across thin, vascularized filaments.
Fish Digestive System (Separate)
- Mouth → esophagus → stomach → intestine
- Digestive glands: liver, pancreas
- Functions: ingestion, mechanical/chemical digestion, nutrient absorption, waste elimination
No anatomical or functional overlap exists. Gills = gas exchange; Gut = nutrient processing.
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