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

Enamel, the hardest substance in the body, is composed primarily of which type of phosphate crystals?

Hydroxyapatite

Calcium oxalate

Sodium chloride

Magnesium phosphate

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Verified step by step guidance

Understand the composition of enamel: Enamel is the hardest substance in the human body and is primarily composed of mineralized crystals that provide its strength and durability.

Identify the primary mineral in enamel: The main mineral found in enamel is hydroxyapatite, which is a crystalline form of calcium phosphate. This mineral is responsible for the hardness and resilience of enamel.

Compare the options provided: Hydroxyapatite is the correct answer because it is the specific type of calcium phosphate crystal found in enamel. Calcium oxalate, sodium chloride, and magnesium phosphate are not components of enamel.

Recall the chemical formula for hydroxyapatite: Hydroxyapatite has the chemical formula \( Ca_{10}(PO_4)_6(OH)_2 \), which indicates it contains calcium, phosphate, and hydroxide ions.

Conclude the reasoning: Based on the composition of enamel and the chemical properties of hydroxyapatite, it is clear that hydroxyapatite is the correct answer to the question.