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 of the following statements about the thymus is true?

The thymus increases in size and activity throughout adulthood.

The thymus produces antibodies directly.

The thymus is the primary site for T cell maturation.

The thymus is located in the abdominal cavity.

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Verified step by step guidance

Step 1: Begin by identifying the thymus as an organ of the lymphatic and immune systems. It plays a critical role in the development and maturation of T lymphocytes (T cells), which are essential for adaptive immunity.

Step 2: Understand the location of the thymus. The thymus is located in the mediastinum, which is the central compartment of the thoracic cavity, not the abdominal cavity.

Step 3: Clarify the function of the thymus. The thymus does not produce antibodies directly; this is the role of B cells, which mature in the bone marrow. The thymus is responsible for the maturation of T cells, which are involved in cell-mediated immunity.

Step 4: Note the changes in the thymus over time. The thymus is most active during childhood and adolescence, but it decreases in size and activity after puberty, undergoing a process called involution.

Step 5: Conclude that the correct statement is: 'The thymus is the primary site for T cell maturation,' as this accurately describes its primary function in the immune system.