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

1. Introduction to Anatomy & Physiology

Introduction to Organ Systems

Anatomy & Physiology

1. Introduction to Anatomy & Physiology

Introduction to Organ Systems

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Multiple Choice

Which physical feature allows amniotes to be completely terrestrial?

Gills

Moist skin

Amniotic egg

External fertilization

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Verified step by step guidance

Understand the term 'amniotes': Amniotes are a group of vertebrates that include reptiles, birds, and mammals. They are characterized by having an amniotic egg, which allows them to lay eggs on land or retain the fertilized egg within the mother.

Identify the key feature of amniotes: The amniotic egg is a crucial adaptation that allows these animals to be completely terrestrial. It provides a protective environment for the developing embryo, reducing the need for a water-based habitat.

Compare with other features: Gills and moist skin are features associated with aquatic or semi-aquatic life forms, such as fish and amphibians, which require a moist environment for respiration and reproduction.

Consider the role of external fertilization: External fertilization is common in aquatic environments where eggs and sperm are released into the water. Amniotes, however, typically use internal fertilization, which is more suited to terrestrial life.

Conclude why the amniotic egg is the correct answer: The amniotic egg contains membranes that protect the embryo, provide nourishment, and facilitate gas exchange, enabling the embryo to develop in a terrestrial environment without the need for water.