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

The layer responsible for whorled ridges on the epidermal surfaces is indicated by ________.

stratum basale

stratum corneum

stratum lucidum

stratum granulosum

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Verified step by step guidance

Understand the structure of the epidermis: The epidermis is composed of several layers, including the stratum basale, stratum spinosum, stratum granulosum, stratum lucidum (only in thick skin), and stratum corneum. Each layer has specific functions and characteristics.

Learn about whorled ridges: Whorled ridges are the patterns on the skin surface, such as fingerprints, which are formed by the interaction of the dermis and epidermis. These ridges are influenced by the underlying dermal papillae and the basal layer of the epidermis.

Focus on the stratum basale: The stratum basale (also called the basal layer) is the deepest layer of the epidermis. It contains actively dividing cells and is responsible for generating new keratinocytes. This layer interacts with the dermis to form the ridges seen on the epidermal surface.

Eliminate other options: The stratum corneum is the outermost layer, composed of dead keratinized cells, and does not contribute to ridge formation. The stratum lucidum is found only in thick skin and is a clear layer without involvement in ridge formation. The stratum granulosum is involved in keratinization but does not directly contribute to ridge patterns.

Conclude that the stratum basale is the correct answer: Based on its role in forming the ridges through interaction with the dermis, the stratum basale is responsible for the whorled ridges on the epidermal surfaces.