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Difficulty: EasyHealth, Nutrition, and Disease

In human nutrition, macronutrients serve distinct physiological roles to maintain cellular function and overall health. Match each dietary macronutrient on the left with its primary function in the body on the right.

  • CarbohydratesProvides the body's primary and most readily available source of cellular energy
  • ProteinsSupplies raw materials for tissue growth, structural repair, and enzyme synthesis
  • Lipids (Fats)Provides long-term energy storage, organ insulation, and cell membrane structure
  • Dietary FiberPromotes healthy bowel motility and assists in regulating blood glucose and cholesterol absorption

Answer

Carbohydrates pair with providing the primary cellular energy source; Proteins pair with tissue growth, repair, and enzyme synthesis; Lipids pair with long-term energy storage, insulation, and membrane structure; Dietary Fiber pairs with promoting bowel motility and regulating nutrient absorption.
Each macronutrient performs a specialized metabolic task: carbohydrates are the primary source of rapid energy; proteins supply amino acids to build tissues and enzymes; lipids provide long-term energy storage, insulation, and membrane integrity; and dietary fiber supports gastrointestinal motility.

Step-by-Step Solution

1
Determine the primary physiological role of carbohydrates
Carbohydrates yield glucose, which is metabolized in cellular respiration to produce immediate ATP energy.
Carbohydrates are the body's preferred and most accessible short-term energy substrate.
2
Determine the primary physiological role of proteins
Proteins supply amino acid building blocks for synthesizing cellular structures, contractile fibers, and metabolic enzymes.
Proteins primarily serve structural and catalytic functions rather than routine energy storage.
3
Determine the primary physiological role of lipids (fats)
Lipids form phospholipid bilayers, insulate vital organs, and hold concentrated energy reserves.
Lipids yield more calories per gram than carbohydrates and provide sustained energy storage.
4
Determine the primary physiological role of dietary fiber
Fiber adds bulk to the digestive contents, aiding gastrointestinal transit and metabolic regulation.
Indigestible plant fiber passes through the digestive tract to support digestive health.

Key Concept

Macronutrient functions in human nutrition and metabolism
Estimated Time:45s
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Topics

Health, Nutrition, and Disease

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