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

In what way does a notochord differ from a proper backbone in vertebrates?

A notochord is found only in adult vertebrates, while a backbone is present in embryos.

A notochord provides less support than a backbone because it is hollow.

A notochord is made of bone, whereas a backbone is made of cartilage.

A notochord is a flexible rod-like structure, while a backbone is composed of vertebrae.

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Verified step by step guidance

Understand the basic definitions: A notochord is a flexible, rod-like structure found in the embryonic stage of all chordates, including vertebrates. It serves as a primary axial support structure.

Recognize the composition differences: The notochord is composed of cells and connective tissue, providing flexibility and support. In contrast, a backbone (or vertebral column) is made up of individual vertebrae, which are bony or cartilaginous structures.

Identify the developmental differences: The notochord is present during the early stages of development in vertebrates and is often replaced by the vertebral column as the organism matures.

Consider the functional differences: The notochord provides structural support and defines the primitive axis of the embryo, while the backbone offers more rigid support and protection for the spinal cord in adult vertebrates.

Clarify the evolutionary significance: The presence of a notochord is a key characteristic of the phylum Chordata, and its evolution into a vertebral column is a significant step in the development of vertebrates.