What is the term for the process by which the body breaks down food into smaller molecules for absorption?

Question

BlackTom AI · Accepted Answer

Digestion is the coordinated mechanical and chemical breakdown of food into small molecules that can be absorbed into the bloodstream.

1. Relevant knowledge points and concepts
- Mechanical digestion: physical breakdown (chewing, stomach churning) that increases surface area.
- Chemical digestion: enzymes (amylase, protease, lipase) breaking macromolecules (carbohydrates, proteins, fats) into their monomers (sugars, amino acids, fatty acids + glycerol).
- Absorption: uptake of those monomers across the intestinal epithelium (villi and microvilli) into blood or lymph.
- Purpose: convert food into forms usable by cells for energy, growth, and repair.

2. Complete reasoning process step by step
- Food enters the mouth where teeth and saliva begin mechanical and chemical breakdown (salivary amylase starts starch digestion).
- In the stomach, muscles churn food and pepsin begins protein digestion.
- In the small intestine, pancreatic enzymes and bile further chemically digest carbohydrates, proteins, and fats into absorbable monomers.
- Villi and microvilli increase surface area for absorption; nutrients pass into capillaries (sugars, amino acids) or lacteals (fatty acids).
- Thus the overall process that turns whole foods into absorbable molecules is digestion.

3. Calculations
- No numerical calculations are required for this concept-based question.

4. Why the correct answer is correct
- "Digestion" precisely names the sequence of mechanical and chemical processes that reduce complex food molecules to absorbable units and enables their uptake—matching the question’s description.

5. Why other options are incorrect
- Circulation: refers to transport of blood, oxygen, nutrients around the body (heart and blood vessels), not the breakdown of food.
- Respiration: can mean breathing or cellular respiration (oxidation of glucose to produce ATP); it does not describe the process of breaking food into absorbable molecules.
- Excretion: is the removal of metabolic wastes (urine, sweat, CO2), not the digestive breakdown and absorption of nutrients.

6. Conclusion
The process by which the body breaks down food into smaller molecules for absorption is Digestion, which matches the provided correct answer.

What is the term for the process by which the body breaks down food into smaller molecules for absorption?单项选择题

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