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

21. The Immune System

Introduction to the Immune System

Anatomy & Physiology

21. The Immune System

Introduction to the Immune System

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Multiple Choice

Which structure filters foreign particles and contains white blood cells?

Bone marrow

Lymph nodes

Spleen

Thymus

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Verified step by step guidance

Begin by understanding the primary function of each structure listed in the problem. Bone marrow is responsible for producing blood cells, including white blood cells, but it does not filter foreign particles.

Next, consider the role of the spleen. The spleen filters blood, removing old or damaged red blood cells and foreign particles, and it also contains white blood cells. However, its primary function is not filtering foreign particles from lymph.

Examine the thymus. The thymus is involved in the maturation of T lymphocytes (a type of white blood cell) but does not filter foreign particles.

Focus on lymph nodes. Lymph nodes are small, bean-shaped structures that filter lymph fluid, trapping foreign particles such as bacteria and viruses. They contain white blood cells, particularly lymphocytes, which help in the immune response.

Conclude that lymph nodes are the correct answer because they are specifically designed to filter foreign particles from lymph and contain white blood cells to combat infections.