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 is rich in lipid secretions?

Stratum granulosum

Stratum corneum

Stratum spinosum

Stratum basale

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Verified step by step guidance

Step 1: Understand the structure of the epidermis, which consists of five layers: stratum basale, stratum spinosum, stratum granulosum, stratum lucidum (only in thick skin), and stratum corneum.

Step 2: Recall the function of the stratum granulosum, which is responsible for producing keratohyalin granules and lipid secretions that contribute to the skin's waterproof barrier.

Step 3: Compare the functions of the other layers: the stratum basale is involved in cell division, the stratum spinosum provides strength and flexibility, and the stratum corneum is the outermost layer composed of dead keratinized cells.

Step 4: Note that lipid secretions are specifically associated with the stratum granulosum, as this layer contains lamellar bodies that release lipids to form a hydrophobic barrier.

Step 5: Conclude that the correct answer is the stratum granulosum, as it is the layer rich in lipid secretions essential for maintaining the skin's protective barrier.