Which nutrient is essential for building and repairing tissues?

Question

BlackTom AI · Accepted Answer

Proteins are macronutrients made of amino acids and serve as the primary material for building and repairing body tissues.

1. Relevant knowledge points and concepts
- Macronutrients: proteins, carbohydrates, and fats; each has distinct roles.  
- Proteins: polymers of amino acids (essential and nonessential). Essential amino acids must be obtained from the diet.  
- Biological roles of protein: growth, tissue repair, muscle maintenance, enzymes, hormones, antibodies, transport proteins.  
- Vitamin D: fat-soluble vitamin important for calcium absorption and bone health.  
- Potassium: an essential mineral and electrolyte important for nerve and muscle function and fluid balance.  
- Fiber: a form of non-digestible carbohydrate that aids digestion and bowel regularity.

2. Complete reasoning process step by step
- The question asks which nutrient is essential for building and repairing tissues. Building and repairing tissues requires structural molecules and amino acids to synthesize proteins such as collagen, actin, and myosin.  
- Dietary protein supplies the amino acid building blocks needed for protein synthesis in the body. Without adequate protein, the body cannot synthesize the structural and functional proteins necessary for tissue repair.  
- Therefore the nutrient that directly provides components for tissue synthesis and repair is protein.

3. Intermediate steps / evidence
- Tissue repair requires new protein synthesis. Example: after muscle damage, satellite cells use amino acids to rebuild muscle fibers—this process depends on available dietary protein.  
- Collagen, the main structural protein in connective tissue, is synthesized from amino acids derived from protein intake.

4. Why the correct answer is correct
- Protein is the direct source of amino acids required for forming and repairing tissues. It is uniquely suited for this role compared with vitamins, minerals, or fiber.

5. Why other options are incorrect
- Vitamin D: supports bone health by regulating calcium but does not provide building blocks for tissue synthesis.  
- Potassium: critical for cellular electrical gradients and muscle/nerve function, not a structural building material.  
- Fiber: aids digestion and bowel health but is not used to build or repair body tissues.

6. Conclusion
Protein is the nutrient essential for building and repairing tissues. This matches the provided correct answer: Protein.

Which nutrient is essential for building and repairing tissues?单项选择题

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