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

4. Tissues & Histology

Introduction to Epithelial Tissue

Anatomy & Physiology

4. Tissues & Histology

Introduction to Epithelial Tissue

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Multiple Choice

A nutrient in the small intestine is absorbed into the bloodstream. In doing so, it moves from being dissolved in the chyme present in the small intestine to being dissolved in the plasma of the blood. How many times did the nutrient pass through epithelial tissue when moving from the intestine to the blood?

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Verified step by step guidance

Understand the structure of the small intestine: The small intestine is lined with epithelial cells that form the mucosal layer. These cells are responsible for the absorption of nutrients.

Identify the process of absorption: Nutrients in the chyme must pass through the epithelial cells of the intestinal lining to enter the bloodstream. This involves crossing the cell membrane twice: once to enter the epithelial cell and once to exit into the bloodstream.

First passage through epithelial tissue: The nutrient first crosses the apical membrane of the epithelial cell, moving from the lumen of the intestine into the cell itself.

Second passage through epithelial tissue: The nutrient then crosses the basolateral membrane of the epithelial cell, moving from the cell into the interstitial fluid and subsequently into the capillaries of the bloodstream.

Conclude the number of passages: Since the nutrient crosses two membranes (apical and basolateral) of the epithelial cells, it passes through epithelial tissue twice during absorption from the intestine to the blood.