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

Early Embryonic Development

Anatomy & Physiology

28. Human Development

Early Embryonic Development

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Multiple Choice

In which group of animals is the gastrula stage of embryonic development observed?

Sponges

Cnidarians

Mammals

Insects

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Verified step by step guidance

Begin by understanding the concept of embryonic development stages. The gastrula stage is a phase where the embryo undergoes significant cellular rearrangement to form the three primary germ layers: ectoderm, mesoderm, and endoderm.

Recognize that the gastrula stage is a characteristic of animals that undergo complex embryonic development, typically seen in organisms with bilateral symmetry and more advanced body plans.

Consider the groups of animals listed: Sponges, Cnidarians, Mammals, and Insects. Sponges and Cnidarians are simpler organisms with less complex embryonic development, often lacking a true gastrula stage.

Mammals, being more complex organisms, undergo a complete embryonic development process, including the gastrula stage, where the three germ layers are formed, leading to the development of various tissues and organs.

Insects, while they do undergo embryonic development, have a different process that does not prominently feature a gastrula stage as seen in mammals. Therefore, the gastrula stage is most commonly associated with mammals.