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

How do epithelial cells obtain their nourishment and remove waste products?

By active transport from the surface

By diffusion from underlying connective tissue

By direct absorption from the external environment

Through their own blood vessels

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Verified step by step guidance

Understand the structure and function of epithelial tissue: Epithelial cells form a protective layer that covers surfaces and lines cavities in the body. They are avascular, meaning they lack their own blood vessels.

Recognize the role of connective tissue: Beneath epithelial tissue lies connective tissue, which contains blood vessels. These blood vessels supply nutrients and remove waste products for the epithelial cells.

Learn the process of diffusion: Diffusion is the passive movement of molecules from an area of higher concentration to an area of lower concentration. Nutrients and waste products move between the epithelial cells and the blood vessels in the connective tissue via diffusion.

Eliminate incorrect options: Active transport from the surface is not applicable because epithelial cells rely on diffusion, not active transport, for nourishment. Direct absorption from the external environment is incorrect because epithelial cells are not directly exposed to blood vessels or external sources. The option 'through their own blood vessels' is incorrect because epithelial cells are avascular.

Conclude that epithelial cells obtain their nourishment and remove waste products by diffusion from the underlying connective tissue, which is supported by the presence of blood vessels in the connective tissue.