Table of contents

1. Introduction to Anatomy & Physiology5h 43m
2. Cell Chemistry & Cell Components12h 36m
3. Energy & Cell Processes10h 6m
4. Tissues & Histology10h 3m
5. Integumentary System2h 20m
6. Bones & Skeletal Tissue2h 16m
7. The Skeletal System2h 35m
8. Joints2h 17m
9. Muscle Tissue2h 33m
10. Muscles1h 11m
11. Nervous Tissue and Nervous System1h 35m
12. The Central Nervous System1h 6m
- Introduction to the Central Nervous System
  18m
- The Cerebrum
  48m
13. The Peripheral Nervous System1h 26m
14. The Autonomic Nervous System1h 38m
15. The Special Senses2h 41m
16. The Endocrine System2h 48m
17. The Blood3h 22m
18. The Heart3h 42m
19. The Blood Vessels3h 35m
20. The Lymphatic System3h 16m
21. The Immune System14h 37m
22. The Respiratory System3h 20m
23. The Digestive System2h 5m
24. Metabolism and Nutrition4h 0m
25. The Urinary System2h 39m
26. Fluid and Electrolyte Balance, Acid Base Balance37m
27. The Reproductive System2h 5m
28. Human Development1h 21m
29. Heredity3h 32m

2. Cell Chemistry & Cell Components

Introduction to Membrane Transport

Anatomy & Physiology

2. Cell Chemistry & Cell Components

Introduction to Membrane Transport

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Multiple Choice

Which substances move through the villi walls into the blood vessels during nutrient absorption in the small intestine?

Starch and glycogen

Amino acids and monosaccharides

Large proteins and triglycerides

Bile salts and cellulose

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Verified step by step guidance

Understand the function of the villi in the small intestine: Villi are small, finger-like projections that increase the surface area for absorption. They contain blood vessels and lacteals to transport absorbed nutrients.

Recall the process of digestion: Starch and glycogen are broken down into monosaccharides (e.g., glucose) by enzymes like amylase and maltase. Proteins are broken down into amino acids by enzymes like pepsin and trypsin.

Identify which substances are small enough to pass through the villi walls: Monosaccharides and amino acids are small molecules that can diffuse or be actively transported into the blood vessels within the villi.

Eliminate incorrect options: Large proteins and triglycerides are too large to be absorbed directly into the blood vessels. Instead, triglycerides are broken down into fatty acids and glycerol, which are absorbed into lacteals, not blood vessels. Bile salts and cellulose are not absorbed; bile salts aid in fat digestion, and cellulose is indigestible fiber.

Conclude that the substances absorbed into the blood vessels through the villi walls are amino acids and monosaccharides, as they are the end products of protein and carbohydrate digestion, respectively.