20. Lymphatic System

Thymus gland

Lymphoid Organs and Tissues

Thymus Gland

 Peyer’s patches prevent bacteria from migrating through the wall of the intestine. 

 Aggregates of lymphoid nodules located in the wall of the ileum of the small intestine are __________. 

 The site of erythrocyte production in the fetus is the spleen. 

 Which lymphatic structure may also be a site of erythrocyte production in the fetus? 

Thymus Gland 

 The spleen holds a reservoir of platelets; it also removes old and damaged red blood cells. 

 In addition to its lymphoid function, which organ holds a reservoir of platelets? 

 The thymus is the site of T cell maturation, not a tissue guarding mucosal surfaces. 

 Collections of lymphoid tissue that guard mucosal surfaces (MALT) include all the following EXCEPT __________. 

 to serve as an immune system surveillance organ 

 The spleen serves as an immune system surveillance organ; it also stores platelets and breaks down erythrocytes. There are plenty of T cells in the white pulp of the spleen, but the T cells do not mature there; the exclusive role of the thymus is to foster T cell maturation. 

 to serve as a site of T cell maturation 

 Which of the following is NOT a role of the spleen? 

 Which structure, attached to the cecum, is in an ideal location to destroy bacteria before they breach the intestinal wall? 

 If the spleen is removed, the liver will take over its function. 

 The spleen’s capsule is very thin and can be ruptured easily by a direct blow. 

 In children under the age of 12 years old, the spleen will regenerate if a small piece is left in the body. 

 It is best to perform a splenectomy if the spleen is damaged in a car accident. 

 Which of the following statements about the spleen is FALSE? 

 The thymus is prominent in newborns and continues to increase in size until the child is about a year old. After puberty, the thymus begins to diminish in size. Unlike other lymphoid tissues or organs, the thymus does not directly combat foreign antigens. Instead, the exclusive role of the thymus is to foster T cell maturation (not B cell maturation). Structurally, the thymus is the only lymphoid tissue or organ that lacks 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. 

 Choose the true statement about the thymus. 

Spleen Anatomy and Physiology

Spleen

Lymph Nodes

 The palatine tonsils are most often infected. 

 What lymphatic structures trap bacteria in the posterior oral cavity? 

 The red pulp of the spleen is composed of reticular fibers rich in macrophages, not lymphocytes. 

 Lymph sinuses are lymph vessels crisscrossed by reticular fibers. 

 There are no medullary cords in the spleen. 

 Areas of lymphocytes suspended by reticular fibers in the spleen are known as __________. 

 The tonsils form a ring of lymphatic tissue around the entrance to the pharynx. 

 The lymphoid organ(s) located in the throat that defend(s) against invading bacteria coming in through the mouth and nose is/are __________. 

 The main role of the tonsils is to gather and remove pathogens entering through the pharynx. 

 gather and remove pathogens entering through the pharynx 

 The main role of the tonsils is to __________. 

 Which of the following is/are the major lymphoid organ(s) that &quot;train(s)&quot; T lymphocytes to become immunocompetent? 

 Lymphocytes are located in the white pulp. 

 The spleen’s white pulp is composed primarily of __________. 

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Anatomy & Physiology

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Armando Hasudungan

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Catalyst University

Dr. John Campbell

AK LECTURES

1. Introduction to A&P

2. Chemistry

3. Cells

4. Tissues

5. Integumentary System

6. Bones + Skeletal Tissues

7. Skeletal System

8. Joints

9. Muscles and Muscle Tissue

10. Muscular System

11. Nervous Tissue

12. Central Nervous System

13. Peripheral Nervous System

14. Autonomic Nervous System

15. Special Senses

16. Endocrine System

17. Blood

18. Cardiovascular System: the Heart

19. Cardiovascular System: Blood Vessels

21. Immune System

22. Respiratory System

23. Digestive System

24. Nutrition, Metabolism, Energy Balance

25. Urinary System

26. Fluid and Electrolyte Balance, Acid Base Balance

27. Reproductive System

28. Pregnancy and Human Development

29. Heredity

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Lymphatic vessels

Lymphatic System

Lymphoid tissue

Lymph nodes

Spleen and lymph nodes

General Chemistry

Jules

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Physics

Patrick