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

7. The Skeletal System

Introduction to the Skeleton

Anatomy & Physiology

7. The Skeletal System

Introduction to the Skeleton

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Multiple Choice

How many bones are fused to form the sacrum in the adult human skeleton?

Four

Three

Seven

Five

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Verified step by step guidance

Understand the anatomy of the sacrum: The sacrum is a triangular-shaped bone located at the base of the spine, between the lumbar vertebrae and the coccyx. It plays a crucial role in supporting the pelvis and connecting the spine to the lower limbs.

Learn about the developmental process: In early development, the sacrum consists of five separate vertebrae (S1 to S5). These vertebrae are distinct and separated by intervertebral discs during childhood.

Recognize the fusion process: As a person matures, these five sacral vertebrae gradually fuse together into a single, solid bone. This fusion typically occurs during adolescence and is complete by adulthood.

Relate the fusion to the adult skeleton: In the adult human skeleton, the sacrum is considered one bone, but it is formed by the fusion of five individual vertebrae. This is why the correct answer is 'Five.'

Apply this knowledge to similar questions: Whenever asked about fused bones in the sacrum, remember that the sacrum is formed by the fusion of five vertebrae, which is a key anatomical feature of the adult human skeleton.