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

5. Integumentary System

The Epidermis: Layers

Anatomy & Physiology

5. Integumentary System

The Epidermis: Layers

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Multiple Choice

Which layer of the epidermis receives the highest levels of oxygen from the blood supply?

Stratum basale

Stratum lucidum

Stratum corneum

Stratum granulosum

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Verified step by step guidance

Understand the structure of the epidermis: The epidermis is the outermost layer of the skin and is composed of several sublayers, including (from deepest to most superficial): stratum basale, stratum spinosum, stratum granulosum, stratum lucidum (only in thick skin), and stratum corneum.

Recognize that the epidermis is avascular: This means it does not have its own blood supply. Oxygen and nutrients must diffuse from the blood vessels located in the dermis, which lies beneath the epidermis.

Identify the layer closest to the dermis: The stratum basale is the deepest layer of the epidermis and is directly adjacent to the dermis. This proximity allows it to receive the highest levels of oxygen and nutrients through diffusion.

Compare the other layers: As you move upward through the epidermis (toward the stratum corneum), the distance from the dermis increases, and the availability of oxygen and nutrients decreases. The stratum lucidum and stratum corneum are farthest from the dermis and receive the least oxygen.

Conclude that the stratum basale receives the highest levels of oxygen: This is due to its direct contact with the dermis, making it the most nourished layer of the epidermis.