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

The Thoracic Cage

Anatomy & Physiology

7. The Skeletal System

The Thoracic Cage

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Multiple Choice

The 11th and 12th ribs are called floating ribs because they lack __________.

an anterior attachment to lumbar vertebrae

an anterior attachment to the sternum

a vertebral attachment anteriorly

a posterior attachment to thoracic vertebrae

a vertebral attachment posteriorly

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Verified step by step guidance

Understand the anatomy of the rib cage: The human rib cage consists of 12 pairs of ribs, which are categorized into true ribs, false ribs, and floating ribs.

Identify the characteristics of floating ribs: The 11th and 12th pairs of ribs are known as floating ribs.

Recognize the attachment points of ribs: Most ribs have both anterior and posterior attachments. Anteriorly, ribs typically attach to the sternum, while posteriorly, they attach to the thoracic vertebrae.

Determine what floating ribs lack: Floating ribs are unique because they do not have an anterior attachment to the sternum, unlike other ribs that connect to the sternum via costal cartilage.

Conclude the defining feature of floating ribs: The absence of an anterior attachment to the sternum is what classifies the 11th and 12th ribs as floating ribs.