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

Introduction to the Integumentary System

Anatomy & Physiology

5. Integumentary System

Introduction to the Integumentary System

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Multiple Choice

Which part of a tooth often becomes thinner over time due to brushing, teeth grinding, and consumption of acidic foods?

Enamel

Dentin

Pulp

Cementum

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Verified step by step guidance

Understand the structure of a tooth: A tooth is composed of four main layers—enamel, dentin, pulp, and cementum. Each layer has a specific function and composition.

Learn about enamel: Enamel is the outermost layer of the tooth and is the hardest substance in the human body. It protects the inner layers of the tooth from damage and decay.

Identify factors that affect enamel: Enamel can become thinner over time due to mechanical wear (e.g., brushing too hard or teeth grinding) and chemical erosion (e.g., consumption of acidic foods and beverages). Unlike other tissues, enamel cannot regenerate once it is lost.

Compare enamel to other layers: Dentin lies beneath the enamel and is softer, making it more susceptible to damage once enamel is worn away. Pulp is the innermost layer containing nerves and blood vessels, while cementum covers the root of the tooth and anchors it to the jawbone.

Conclude that enamel is the correct answer: Based on its location and susceptibility to wear and erosion, enamel is the part of the tooth that often becomes thinner over time due to brushing, grinding, and acidic foods.