Question 1

Which of the following best describes the primary function of lymphatic vessels in the human body?

Accepted Answer

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

Question 2

A patient presents with swelling in the lower limbs due to fluid accumulation. Which malfunction of the lymphatic system is most likely responsible for this condition?

Accepted Answer

Blockage or damage to lymphatic vessels preventing lymph return

Question 3

Which lymphatic structure is responsible for absorbing dietary fats from the small intestine?

Accepted Answer

Lacteals

Question 4

A biopsy of a lymph node reveals an enlarged germinal center. What is the most likely explanation for this finding?

Accepted Answer

Active production of antibodies by plasma cells

Question 5

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

Accepted Answer

Innate immunity responds rapidly and non-specifically, while adaptive immunity is specific and slower to respond.

Question 6

A patient receives a kidney transplant from a genetically non-identical donor. Which immune cells are primarily responsible for the rejection of the transplanted organ?

Accepted Answer

Cytotoxic T (TC) cells

Question 7

Which of the following best explains why the thymus is most active during childhood?

Accepted Answer

It is the primary site for the maturation and selection of functional T cells.

Question 8

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

Accepted Answer

Opsonization of pathogens to enhance phagocytosis

Question 9

A patient with a genetic deficiency in complement proteins is most likely to experience which of the following?

Accepted Answer

Increased risk of bacterial and parasitic infections

Question 10

Which of the following best describes the role of helper T (TH) cells in the immune response?

Accepted Answer

They secrete cytokines to activate and enhance other immune cells.

Question 11

A patient is diagnosed with an autoimmune disorder in which the immune system attacks the myelin sheath of neurons. Which mechanism is most likely responsible for this condition?

Accepted Answer

Release of self-antigens not previously encountered by T cells

Question 12

Which of the following best explains why fever can be beneficial during an infection?

Accepted Answer

Fever enhances the function of phagocytes and inhibits the growth of some pathogens.

Question 13

Which antibody class is most commonly associated with immediate hypersensitivity (allergic) reactions?

Accepted Answer

IgE

Question 14

A patient is given a vaccine containing inactivated toxins from bacteria. What type of immunity is being induced?

Accepted Answer

Active, artificially acquired immunity

Question 15

Which of the following best describes the process of opsonization?

Accepted Answer

Coating of pathogens by antibodies or complement proteins to enhance phagocytosis

Question 16

A patient with HIV/AIDS is most likely to have a deficiency in which type of immune cell?

Accepted Answer

Helper T (TH) cells

Question 17

Which of the following is a characteristic of the spleen but NOT of lymph nodes?

Accepted Answer

It destroys old erythrocytes in its red pulp.

Question 18

Which of the following best explains why the lymphatic system is considered a 'one-way' system?

Accepted Answer

Lymphatic vessels have valves that prevent backflow, ensuring lymph moves only toward the heart.

Question 19

A patient develops a rash after contact with poison ivy. Which type of hypersensitivity reaction is this, and what is the primary immune cell involved?

Accepted Answer

Type IV hypersensitivity; T cells

Question 20

Which of the following best describes the role of MHC class I molecules in the immune response?

Accepted Answer

They present endogenous antigens to cytotoxic T cells.

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

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