Question 1

Which of the following best describes the primary function of lymphatic vessels in fluid homeostasis?

Accepted Answer

They collect excess interstitial fluid and return it to the cardiovascular system.

Question 2

A patient undergoes surgery that removes several lymph nodes in the axillary region. Which condition is this patient most at risk for developing, and why?

Accepted Answer

Lymphedema, due to impaired lymphatic drainage causing fluid accumulation.

Question 3

Which of the following lymphatic structures is responsible for absorbing dietary fats in the small intestine?

Accepted Answer

Lacteals

Question 4

Which of the following statements about lymphatic capillaries is TRUE?

Accepted Answer

They are blind-ended vessels that allow one-way movement of lymph away from tissues.

Question 5

A patient presents with severe swelling in one leg after a parasitic infection. Which mechanism best explains this finding?

Accepted Answer

Blockage of lymphatic vessels prevents return of interstitial fluid to the bloodstream.

Question 6

Which of the following is a key difference between innate and adaptive immunity?

Accepted Answer

Innate immunity responds to all pathogens in the same way, while adaptive immunity targets specific antigens.

Question 7

Which of the following best describes the role of the thymus in immunity?

Accepted Answer

It is the site of T cell maturation and selection for self-tolerance.

Question 8

Which of the following best explains why a secondary immune response is faster and stronger than a primary immune response?

Accepted Answer

Memory B cells generated during the primary response rapidly produce antibodies upon re-exposure to the antigen.

Question 9

Which of the following is a function of the spleen?

Accepted Answer

Filtering pathogens from blood and destroying old erythrocytes.

Question 10

A patient receives an organ transplant from a genetically non-identical member of the same species. Which type of graft is this, and what is the main immunological concern?

Accepted Answer

Allograft; risk of rejection due to differences in MHC antigens.

Question 11

Which of the following best describes the function of MALT (mucosa-associated lymphatic tissue)?

Accepted Answer

It protects mucous membranes from pathogens by housing clusters of B and T cells.

Question 12

Which of the following is a correct pairing of a lymphoid organ and its primary function?

Accepted Answer

Lymph node – filters lymph and traps pathogens.

Question 13

Which of the following best explains why lymphatic vessels contain valves?

Accepted Answer

To prevent the backflow of lymph, ensuring one-way movement toward the heart.

Question 14

Which of the following is a characteristic of passive immunity?

Accepted Answer

It involves the transfer of preformed antibodies and does not result in memory cell formation.

Question 15

A patient with a bacterial infection is found to have an elevated neutrophil count on a CBC with differential. What does this finding suggest about the immune response?

Accepted Answer

Neutrophils are the primary phagocytes responding to bacterial infections.

Question 16

Which of the following best describes the role of dendritic cells in the immune system?

Accepted Answer

They function as antigen-presenting cells, activating T cells.

Question 17

Which of the following is a function of the complement system in innate immunity?

Accepted Answer

Mediating cell lysis and enhancing inflammation and phagocytosis.

Question 18

Which of the following best explains why the skin is an effective surface barrier against pathogens?

Accepted Answer

It consists of multiple layers of keratinized epithelial cells and secretes acidic sebum.

Question 19

Which of the following best describes the process of inflammation?

Accepted Answer

It is an innate response involving the release of mediators, increased vascular permeability, and recruitment of phagocytes.

Question 20

Which of the following best explains why vaccines are effective in preventing infectious diseases?

Accepted Answer

They induce a primary immune response and generate memory cells for rapid secondary response.

The Lymphatic System and Immunity: Structure, Function, and Clinical Relevance

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