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

Previous problemNext problem

Struggling with Anatomy & Physiology?

Join thousands of students who trust us to help them ace their exams!Watch the first video

Multiple Choice

Which structure within a lymph node is responsible for filtering lymph and contains lymphocytes arranged in follicles?

Medulla

Hilum

Trabeculae

Cortex

Previous problemNext problem

Verified step by step guidance

Step 1: Begin by understanding the anatomy of a lymph node. A lymph node is a small, bean-shaped structure that plays a critical role in the immune system by filtering lymph and housing immune cells.

Step 2: Identify the key structures within a lymph node. These include the cortex, medulla, hilum, and trabeculae. Each structure has a specific function and arrangement of cells.

Step 3: Focus on the cortex. The cortex is the outer region of the lymph node and contains lymphoid follicles. These follicles are rich in lymphocytes, particularly B cells, which are essential for immune responses.

Step 4: Compare the cortex to the other structures mentioned in the problem. The medulla is the inner region of the lymph node and contains medullary cords and sinuses, which are involved in lymph flow. The hilum is the area where blood vessels and efferent lymphatic vessels exit the node. Trabeculae are connective tissue extensions that provide structural support but do not contain lymphoid follicles.

Step 5: Conclude that the cortex is the structure responsible for filtering lymph and housing lymphocytes arranged in follicles, as it is specifically designed for immune cell activity and lymph filtration.