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

Which letter on the diagram indicates motile structural elements of the epithelial membrane?

B: Microvilli

C: Basement membrane

D: Tight junctions

A: Cilia

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Verified step by step guidance

Understand the question: The problem is asking which structural element of the epithelial membrane is motile (capable of movement). The options provided are cilia, microvilli, basement membrane, and tight junctions.

Review the characteristics of each option: Cilia are hair-like structures that extend from the surface of certain epithelial cells and are motile, meaning they can move to propel substances over the epithelial surface. Microvilli are non-motile projections that increase surface area for absorption. The basement membrane is a non-cellular structure that provides support and anchorage for epithelial cells. Tight junctions are cell-to-cell connections that prevent the passage of substances between cells.

Focus on the key term 'motile': Since the question specifies motility, eliminate options that are not capable of movement. Microvilli, the basement membrane, and tight junctions are all non-motile structures.

Identify the correct answer: Based on the information, cilia are the only motile structural elements listed in the options. They are responsible for moving mucus, debris, or other substances across the epithelial surface in areas like the respiratory tract.

Confirm the answer: The correct answer is A: Cilia, as they are the only motile structures among the options provided.