DONE The Lymphatic System

Question 1

What are the 4 components of the lymphatic system?

Answer 1

Lymph
Lymphatic organs
Lymphatic vessels
Lymph nodes

Question 2

Lymph

Answer 2

pH 7.4
Lymph in GI tract = chyle
3-4 L per day

Question 3

Lymphatic organs

Answer 3

Vermiform appendix, tonsils, Payer’s patches, spleen, thymus

Question 4

Lymphatic vessels

Answer 4

Capillaries > ducts > trunks > veins

Question 5

Lymph nodes

Answer 5

Neck = cervical, groin = inguinal, armpit = axillae
Afferent = enter via convex surface
Efferent (Exit) = leave via concave hilium
Follicular dendritic cells, macrophages + B/T cells

Question 6

Functions of lymphatic system

Answer 6

Fluid balance
Transport fats + fat-sol. vits.
Immune response
Store + destroy aged erythrocytes

Question 7

Flow of lymph

Answer 7

Upper right quadrant drains into right subclavian vein

Question 8

Lymphatic capillary vs. Vein

Answer 8

Low pressure
Valves
Less smooth muscle
Lymphangion compression by local veins/arteries propels lymph

Question 9

Thymus

Answer 9

In superior mediastinum (near trachea)
Mainly active in children
Function = mature bone marrow derived stem cells to T cells

Question 10

Spleen

Answer 10

Largest lymphatic organ
Inferior to diaphragm, posterior to stomach
Function = immune (antigen presentation by APCs, antibody + T/B cell proliferation), haemopoeitic (store + remove damaged erythrocytes)

Question 11

Tonsils

Answer 11

Near oropharynx + nasopharynx
Form part of Waldeyer’s ring
Function = prevent pathogen entry via oral/nasal routes

Question 12

Vermiform appendix

Answer 12

Attached to ascending colon

Function = prevent pathogen entry via GI routes

Question 13

Payer’s patches

Answer 13

Side of ileum

Function = prevent pathogen ingress through digestion

Question 14

Sentinel lymph nodes

Answer 14

1st set of lymph nodes that swell in cancer