Functions of Digestive System Parts

Steps:

• Recall digestive processes: ingestion (food intake), digestion (breakdown), absorption (nutrient uptake), egestion (waste removal).
• Assign P to a digestion site, like the stomach, where enzymes and acids break down food.
• Assign Q to another digestion area, such as the small intestine's initial section, continuing enzymatic breakdown.
• Assign R to the absorption region, primarily the small intestine, where nutrients enter the bloodstream.
• Assign S to the egestion point, like the rectum and anus, for expelling undigested waste.

Why D is correct:

• D aligns with definitions: digestion occurs in stomach (P) and small intestine (Q), absorption in jejunum/ileum (R), egestion via feces expulsion (S).

Why the others are wrong:

• A misplaces ingestion at S (egestion) and absorption at Q (digestion).
• B incorrectly labels R as absorption but Q as digestion instead of distinguishing sites.
• C wrongly assigns P as ingestion (should be digestion) and mixes Q/R roles.

Final answer: D