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1. Science of Nutrition(0)

What is Nutrition
(0)

Nutrients
(0)

Macronutrients
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Micronutrients
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Fiber and Phytochemicals
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Energy in Food
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Nutrition as a Science
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Finding Credible Nutrition Information
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2. Tools for Healthful Eating(0)

Healthful Eating
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Three Guides to a Healthful Diet
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Dietary Guidelines for Americans
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Dietary Reference Intakes
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Food Labels
(0)

3. The Human Body & Digestion(0)

Hunger, Satiety, and Hormones
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Overview of the Digestive System
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Organs of the Gastrointestinal Tract
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Accessory Organs
(0)

Nutrient Absorption and Transport
(0)

The Gut Microbiome
(0)

Disorders of the Digestive System
(0)

4. Carbohydrates(0)

Intro to Carbohydrates
(0)

Simple vs Complex Carbohydrates
(0)

Why Do We Need Carbohydrates?
(0)

Fiber
(0)

Carbohydrate Digestion
(0)

Dietary Guidelines for Carbohydrates
(0)

Alternative Sweeteners
(0)

Blood Glucose Regulation
(0)

Diabetes
(0)

5. Lipids(0)

Introduction to Lipids
(0)

Why Do We Need Lipids?
(0)

Fatty Acids
(0)

Digestion of Fats
(0)

Dietary Guidelines for Lipids
(0)

Cardiovascular Disease
(0)

6. Proteins(0)

Introduction to Proteins
(0)

Protein Structure
(0)

Protein Synthesis
(0)

Why Do We Need Protein?
(0)

Protein Digestion
(0)

Dietary Guidelines for Proteins
(0)

Protein-Related Disorders
(0)

7. Vitamins(0)

Introduction to Vitamins
(0)

Fat-Soluble Vitamins
(0)

Water-Soluble Vitamins
(0)

Dietary Guidelines for Vitamins
(0)

Other Vitamin-Like Nutrients
(0)

8. Water and Minerals(0)

Water
(0)

Introduction to Minerals
(0)

Major Mineral: Sodium and Potassium
(0)

Hypertension and Minerals
(0)

Major Mineral: Calcium and Phosphorus
(0)

Osteoporosis: Minerals and Bone Health
(0)

Major Mineral: Chloride, Magnesium, & Sulfur
(0)

Trace Minerals: Iron and Copper
(0)

Trace Minerals: Fluoride and Iodine
(0)

Other Trace Minerals
(0)

9. Alcohol(0)

Alcohol Consumption
(0)

Alcohol Metabolism
(0)

Short-Term Effects of Alcohol
(0)

Long-Term Effects of Alcohol
(0)

10. Energy Balance: Body Weight, Obesity, & Eating Disorders(0)

Healthy Weight
(0)

Energy Balance
(0)

Assessing Weight Related Health Risk
(0)

Factors That Influence Weight
(0)

Weight Loss
(0)

Maintaining Weight
(0)

Gaining Weight
(0)

Eating Disorders
(0)

11. Nutrition & Fitness(0)

Introduction to Physical Fitness
(0)

Exercise
(0)

Using Energy to Fuel Exercise
(0)

Nutrition & Physical Activity
(0)

Ergogenic Aids
(0)

12. Food Safety & Regulation(0)

Food Safety
(0)

Foodborne Pathogens
(0)

Foodborne Toxins
(0)

Food Preservation & Additives
(0)

U.S. Food Safety Systems
(0)

Natural, Organic, & Bioengineered Foods
(0)

13. Food Insecurity in the US and the World(0)

Food Insecurity
(0)

Global Food Insecurity
(0)

14. Nutrition: Pregnancy Through Infancy (0)

Preconception Nutrition
(0)

Nutrition During Gestation
(0)

Potential Complications During Pregnancy
(0)

Breastfeeding
(0)

Nutritional Needs for Infants
(0)

15. Nutrition: Toddlers to Late Adulthood(0)

Nutrition For Young Children (Ages 1-5)
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Nutrition For School-Age Children (Ages 6-11)
(0)

Nutrition During Adolescence (Ages 12-19)
(0)

Nutrition For Older Adults (Ages 50+)
(0)

3. The Human Body & Digestion

Nutrient Absorption and Transport

3. The Human Body & Digestion

Nutrient Absorption and Transport: Videos & Practice Problems

Video Lessons Practice Worksheet

Back to all problems

8 of 0

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Problem 8Multiple Choice

An infant is given formula containing large intact antibodies. Which intestinal uptake mechanism most likely explains how these macromolecules can cross neonatal enterocytes intact, and why does this process decline with age?

Endocytosis (including receptor-mediated transcytosis) allows enterocytes to engulf and transport intact antibodies; it declines as the gut matures and tight junctions and proteolytic activity increase.

Direct secretion from the liver into the neonatal bloodstream bypassing the intestine entirely; intestinal uptake does not explain neonatal antibody presence.

Passive diffusion through the lipid bilayer due to antibodies becoming hydrophobic in the neonatal gut, and this hydrophobicity is lost later in life.

Facilitated diffusion through general ion channels because antibodies mimic electrolytes in neonates, and channel expression increases with age causing decreased antibody proteostasis.

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