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 Heart2h 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

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

Choose the true statement about the thymus.

The thymus contains reticular fibers.

The thymus directly fights foreign antigens.

B cells and T cells mature in the thymus.

After puberty, the thymus begins to decrease in size.

Previous problemNext problem

Verified step by step guidance

Understand the role of the thymus in the immune system. The thymus is primarily involved in the maturation of T cells, which are crucial for adaptive immunity.

Recognize the structural components of the thymus. The thymus is composed of epithelial cells and does not contain reticular fibers, which are typically found in lymphoid organs like lymph nodes and the spleen.

Clarify the function of the thymus in relation to foreign antigens. The thymus does not directly fight foreign antigens; instead, it provides an environment for T cell maturation.

Differentiate between the maturation sites of B cells and T cells. B cells mature in the bone marrow, while T cells mature in the thymus.

Understand the changes in the thymus after puberty. After puberty, the thymus begins to decrease in size and becomes less active, a process known as thymic involution.