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

28. Human Development

Embryonic Development (Weeks 3-8)

Anatomy & Physiology

28. Human Development

Embryonic Development (Weeks 3-8)

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Problem 15

Textbook Question

Indicate which primary tissue classes derive from each embryonic germ layer.

Verified step by step guidance

Identify the three primary embryonic germ layers: ectoderm, mesoderm, and endoderm. These layers form during early embryonic development and give rise to all tissues and organs in the body.

Understand that each germ layer differentiates into specific primary tissue classes. The ectoderm primarily forms tissues related to the nervous system and skin.

Recognize that the mesoderm gives rise to connective tissues, muscle tissues, and the cardiovascular system, among others.

Know that the endoderm mainly develops into epithelial tissues lining the digestive and respiratory tracts and associated glands.

Summarize the tissue classes derived from each germ layer: ectoderm → nervous tissue and epidermis (epithelial tissue), mesoderm → muscle tissue, connective tissue, and some epithelial tissues, endoderm → epithelial tissue lining internal organs.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Embryonic Germ Layers

Embryonic germ layers are the three primary layers formed during early embryonic development: ectoderm, mesoderm, and endoderm. Each layer gives rise to specific tissues and organs in the body, serving as the foundation for all differentiated cells.

Primary Tissue Classes

Primary tissue classes include epithelial, connective, muscle, and nervous tissues. These classes represent the main types of tissues in the body, each with distinct structures and functions essential for organ formation and physiological processes.

Tissue Derivation from Germ Layers

Each primary tissue class originates from specific germ layers: ectoderm mainly forms nervous and epithelial tissues, mesoderm produces connective and muscle tissues, and endoderm generates epithelial tissues lining internal organs. Understanding these relationships clarifies developmental biology.

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