Table of contents

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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

20. The Lymphatic System

Overview of Lymphoid Organs

Anatomy & Physiology

20. The Lymphatic System

Overview of Lymphoid Organs

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Multiple Choice

Which lymphoid organ is primarily active during the early years of life?

Thymus

Lymph nodes

Tonsils

Spleen

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Verified step by step guidance

Begin by understanding the role of lymphoid organs in the immune system. These organs are involved in the production and maturation of lymphocytes, which are crucial for immune responses.

Identify the primary function of each lymphoid organ listed: Thymus, Lymph nodes, Tonsils, and Spleen. The thymus is known for its role in the maturation of T lymphocytes during early life.

Consider the developmental timeline of the immune system. The thymus is most active during childhood, where it facilitates the development of a robust immune system by maturing T cells.

Compare the activity levels of these organs during different life stages. The thymus is unique in that it is most active during the early years and gradually decreases in function as one ages.

Conclude that the thymus is the lymphoid organ primarily active during the early years of life, based on its critical role in T cell maturation during childhood.