Question 1

Which of the following best describes the primary function of lymph nodes within the lymphatic system?

Accepted Answer

They filter and cleanse lymph fluid, removing pathogens and debris.

Question 2

What is the main reason lymph fluid only flows toward the heart and not away from it?

Accepted Answer

Lymphatic vessels have one-way (semi-lunar) valves that prevent backflow.

Question 3

Which of the following is NOT a component found in lymph fluid?

Accepted Answer

Red blood cells (RBCs)

Question 4

A patient presents with swollen, tender lymph nodes in the neck following a bacterial infection. What is the most likely explanation for this finding?

Accepted Answer

The lymph nodes are overwhelmed by the pathogens they are trying to destroy.

Question 5

Which organ compensates for the loss of spleen function in adults after a splenectomy?

Accepted Answer

Liver

Question 6

Why are there more afferent than efferent lymphatic vessels associated with a lymph node?

Accepted Answer

To slow the flow of lymph fluid, allowing more time for filtration and immune response.

Question 7

Which of the following is a primary lymphoid organ responsible for the maturation of T lymphocytes?

Accepted Answer

Thymus

Question 8

Which equation best represents the volume of lymph fluid that leaks into the lymphatic system daily?

Accepted Answer

$$3\ \mathrm{L}$$

Question 9

A patient is diagnosed with appendicitis. Which laboratory finding would most likely support this diagnosis?

Accepted Answer

High total white blood cell count and increased neutrophils

Question 10

Which of the following lymphoid tissues is found in the mucosa of the small intestine and is structurally similar to tonsils?

Accepted Answer

Peyer’s patches

Question 11

Which of the following best explains why lymphatic vessels are considered a 'low pressure' system?

Accepted Answer

They lack a central pump and rely on skeletal muscle contraction and breathing for movement.

Question 12

Which of the following is a function of the spleen?

Accepted Answer

Phagocytosis and recycling of old red blood cells and platelets

Question 13

Which of the following is true regarding the development of lymphoid organs?

Accepted Answer

The thymus develops from endodermal origin as an outgrowth of the pharynx.

Question 14

Which of the following best describes the role of MALT (mucosa-associated lymphoid tissue)?

Accepted Answer

Protects mucosal surfaces from pathogens trying to enter the body

Question 15

Which of the following is a correct statement about lymphatic capillary walls?

Accepted Answer

They have flaps that allow interstitial fluid to enter but not leave.

Question 16

Which of the following is NOT a secondary lymphoid organ?

Accepted Answer

Bone marrow

Question 17

Which of the following best explains the term 'lymphadenitis'?

Accepted Answer

Enlarged lymph nodes due to infection or inflammation

Question 18

Which of the following is a correct sequence for the drainage of lymph fluid into the circulatory system?

Accepted Answer

Lymphatic capillaries → lymphatic vessels → lymphatic trunks → thoracic duct/right lymphatic duct → veins

Question 19

Which of the following best describes the difference between granular and agranular leukocytes?

Accepted Answer

Granular leukocytes contain visible cytoplasmic granules; agranular leukocytes do not.

Question 20

Which of the following secondary lymphoid organs can you live without?

Accepted Answer

Spleen, tonsils, and appendix

The Lymphatic System: Structure, Function, and Lymphoid Organs

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