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

Why are the cells in the stratum corneum considered dead?

They are actively dividing to replace deeper cells.

They have lost their nuclei and organelles due to being far from the blood supply.

They are filled with melanin, which causes cell death.

They are constantly exposed to UV radiation, which kills them immediately.

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Verified step by step guidance

Understand the structure of the epidermis: The stratum corneum is the outermost layer of the epidermis, composed of flattened, keratinized cells.

Recognize the role of keratinization: Cells in the stratum corneum undergo keratinization, a process where they produce keratin and lose their nuclei and organelles, making them non-living.

Consider the lack of blood supply: The epidermis is avascular, meaning it lacks blood vessels. Cells in the stratum corneum are farthest from the dermis, where nutrients and oxygen are supplied, leading to their death.

Understand the protective function: The dead cells in the stratum corneum form a tough, protective barrier against environmental damage, pathogens, and water loss.

Eliminate incorrect options: Cells in the stratum corneum are not actively dividing, filled with melanin, or killed immediately by UV radiation. Their death is due to keratinization and distance from the blood supply.