Chapter 23: The Lymphatic System and Immunity Oate: POSTLABORATORY WORKSHEET The

Question

Chapter 23: The Lymphatic System and Immunity Oate: POSTLABORATORY WORKSHEET The correspands to the Do You Know the Basics? Exercise 23.1: Lymphatie Vessels 2 Lymphatic vessels are moat sinilar in structare to Exercise 23.2 Tonsil 2 Manch the deserigtion liated in column A with the bype of tonsail lasted in colume 8. Some answars may be used more than onc) 0 T covered with pseudostratified cliated columnar egithelun a lingual b. palstine c pharyngeal 3. located at the base of the tongue 4 located at the junction of the nasopharyro and oropharynx at the posterior aspect of the soft palate proiects from the roof of the nasoghannx Exercise 23.3: Peyer Patches _MmFalse) 4. Peyer pareh" have, darker-tanng gemnal cerner and . lighterstanngo ter regien.- S Peyer patches are located in the duodesun Exercise 234: The Vermiform Appendiox The vermiform appandix is lined with which type of apithelial dissue? (Circle one) psenatieied ola n b. simple columnar epthelium e. simple cuboidal epithelium d. simple squamous epithelium e. mtted squamous epnelium 7. An individual suffering from an inflamed appendix will most commonly have pain in the luppex/ ower eforight) abdominopelvic quadrant Exercise 23.5:The Thymus 8. Thethymus contains conective tissuo septae that separate the gland into lobules_ 9. The thymus is tho site of BeewT-cell) maturation. 10. An increase in the number of thymic corpuscles indicates that the thymus is (True/False) Exercise 23.6 Lymph Nodes 11. Match the descriptions listed in column A with the structure listed in column B Colume A Colume8 -1, space through which hmph travels withn lymph node afferent 2 structure in the medula of the lymph node that contains T-lymphocyces and macrophages 3. vessel bringing lymph into the lymph mode b. efferant medullary cord -4. vessel taking lymph away from the lymph node d. sinus

Explanation / Answer

1. Lymphatic vessels are structures that carry lymph. They are thin-walled and valved in structure. They have one-way valves so as to prevent the reverse flow of lymph. So, the statement that lymphatic vessels have valves is TRUE.

2. Lymphatic vessels are structures that carry lymph. They are thin-walled and valved in structure. They have one-way valves so as to prevent the reverse flow of lymph. Lymphatic vessels are most similar in structure to veins.

3. Covered with pseudostratified ciliated columnar epithelium Pharyngeal (c).

Covered with stratified squamous (nonkeratinized) epithelium Lingual (a).

Located at the base of the tongue Lingual (a).

Located at the junction of the nasopharynx and oropharynx at the posterior aspect of the soft palate Palatine (b).

Projects from the roof of the nasopharynx Pharyngeal (c).

4. Peyer’s patches are lymphoid follicles mainly located in the mucosal and submucosal regions of the ileum. They have a darker-staining germinal center and a lighter-staining outer region. So, the statement that Peyer’s patches have a darker-staining germinal center and a lighter-staining outer region is TRUE.

5. Peyer’s patches are lymphoid follicles mainly located in the mucosal and submucosal regions of the ileum. So, the statement that Peyer’s patches are located in the duodenum is FALSE.

6. Appendix also known as vermiform appendix is a blind-ended tube that is connected to the cecum. It is made of mucosa, lamina propria, muscularis mucosa, submucosa, muscularis externa, and serosa layers or regions. Simple columnar epithelial cells line the mucosa. Therefore, the vermiform appendix is lined with simple columnar epithelial cells.

7. Inflammation of the appendix is known as appendicitis and is observed in the lower, right abdominal region. Therefore, an individual suffering from an inflamed appendix will most commonly have pain in the lower, right abdominopelvic quadrant.

8. Thymus has 2 regions- a well-defined cortex region and a medulla region that is surrounded by a thin capsule made of connective tissue. Septa are formed from the connective tissue that divides thymus into lobules. So, the statement that the thymus contains connective tissue septae that separate the gland into lobules is TRUE.

9. T-cells also known as T-lymphocytes play a major role in cell mediated immunity. T-cells are so called as they mature in the thymus from thymocytes. So, the thymus is the site of T-cell maturation.

10. Thymic corpuscles also known as Hassall’s corpuscles are found in the medullary region of thymus and are formed from concentrically arranged eosinophilic type VI epithelial reticular cells. The number of these corpuscles in thymus increasse till puberty and their numbers start decreasing after puberty. An increase in the number of thymic corpuscles thus indicates that the thymus is younger.

11. Space through which lymph travels within a lymph node Sinus (d).

Structure in the medulla of the lymph node that contains T-lymphocytes and macrophages Medullary cord (c).

Vessel bringing lymph into the lymph node Afferent (a).

Vessel taking lymph away from the lymph node Efferent (b).

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