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Tracing a Meal Through the Digestive Tract, Worked

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This capstone traces one meal's complete path from ingestion through the digestive tract to nutrient absorption, drawing together this chapter's mechanical, chemical, and organ-level atoms.

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Assuming one enzyme handles a whole meal at once is the error here — three separate digestive pathways run in parallel through the same tract, each with its own enzymes, timing, and site of completion.

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