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

20. The Lymphatic System

Primary Lymphoid Organs

Anatomy & Physiology

20. The Lymphatic System

Primary Lymphoid Organs

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Multiple Choice

Which of the following is a primary lymphoid organ?

Thymus

Spleen

Tonsils

Lymph nodes

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Verified step by step guidance

Understand the role of primary lymphoid organs: These are the sites where lymphocytes (a type of white blood cell) are formed and mature. The primary lymphoid organs include the bone marrow and the thymus.

Identify the function of the thymus: The thymus is a primary lymphoid organ where T lymphocytes (T cells) mature. It is located in the upper chest, behind the sternum.

Differentiate between primary and secondary lymphoid organs: Secondary lymphoid organs, such as the spleen, tonsils, and lymph nodes, are where lymphocytes become activated and initiate immune responses.

Recognize the spleen, tonsils, and lymph nodes as secondary lymphoid organs: These organs are involved in filtering blood or lymph and providing sites for immune cell interactions, but they are not involved in the initial formation and maturation of lymphocytes.

Conclude that the thymus is the primary lymphoid organ among the options provided, as it is responsible for the maturation of T cells, a critical component of the adaptive immune system.