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

Integumentary System: Thermoregulation

Anatomy & Physiology

5. Integumentary System

Integumentary System: Thermoregulation

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Multiple Choice

What substance is produced by the skin to protect against harmful ultraviolet (UV) light?

Melanin

Sebum

Collagen

Keratin

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Verified step by step guidance

Step 1: Begin by identifying the primary function of the skin in relation to protection against ultraviolet (UV) light. The skin has specialized mechanisms to shield the body from UV radiation, which can damage cells and DNA.

Step 2: Review the substances listed in the options and their roles in the body. Melanin is a pigment produced by melanocytes in the skin, and its primary function is to absorb and dissipate UV radiation, protecting skin cells from damage.

Step 3: Understand the role of the other substances listed: Sebum is an oily substance secreted by sebaceous glands to lubricate and waterproof the skin; Collagen is a structural protein that provides strength and elasticity to connective tissues; Keratin is a protein that strengthens the skin, hair, and nails but does not directly protect against UV light.

Step 4: Compare the functions of these substances and determine which one specifically addresses protection against UV light. Melanin is the only substance among the options that directly absorbs UV radiation and reduces its harmful effects.

Step 5: Conclude that melanin is the correct answer based on its unique role in protecting the skin from UV light, while the other substances serve different functions unrelated to UV protection.