Question 1

Which of the following best describes the primary anatomical difference between the immune system and the lymphoid system?

Accepted Answer

The immune system is a population of cells distributed throughout all organs, whereas the lymphoid system is a true organ system with vessels, tissues, and organs.

Question 2

A patient has a blockage in their thoracic duct. Which of the following areas would most likely experience impaired lymph drainage as a result?

Accepted Answer

Left arm, left side of the head, and both legs

Question 3

Which of the following mechanisms does NOT assist in the movement of lymph through lymphatic vessels?

Accepted Answer

Central cardiac pump

Question 4

Lacteals in the small intestine are specialized for which of the following functions?

Accepted Answer

Absorbing dietary lipids too large to enter blood capillaries

Question 5

Which of the following tissues or areas lack lymphatic capillaries?

Accepted Answer

Central nervous system, cartilage, and cornea

Question 6

A patient with a genetic defect preventing the formation of the blood-thymus barrier would most likely experience which of the following consequences?

Accepted Answer

Premature activation of developing T cells by blood-borne antigens

Question 7

Which of the following best explains why the thymus shrinks with age and how this affects immune health?

Accepted Answer

It undergoes involution, reducing new T cell production and contributing to immunosenescence.

Question 8

Which of the following is the correct sequence of lymph flow from tissue fluid to the bloodstream?

Accepted Answer

Lymphatic capillaries → collecting vessels → lymphatic trunks → collecting ducts → subclavian veins

Question 9

Which of the following best describes the function of interferons secreted by virally infected cells?

Accepted Answer

They bind to nearby cells, stimulating antiviral protein synthesis and activating NK cells and macrophages.

Question 10

Which of the following is NOT a primary outcome of activating the complement system?

Accepted Answer

Direct antibody production

Question 11

A patient presents with a tapeworm infection. Which leukocyte would you expect to be elevated in their blood count?

Accepted Answer

Eosinophils

Question 12

Which of the following best distinguishes between innate and adaptive immunity?

Accepted Answer

Innate immunity is nonspecific and lacks memory; adaptive immunity is specific and has memory.

Question 13

Which of the following is an example of natural passive immunity?

Accepted Answer

A fetus acquiring antibodies from its mother through the placenta

Question 14

Which of the following best describes the process of diapedesis during inflammation?

Accepted Answer

Leukocytes crawl through gaps between widened endothelial cells to enter tissue fluid at an injury site.

Question 15

Which of the following is the correct description of an antibody monomer's structure?

Accepted Answer

Composed of four polypeptide chains with variable regions forming the antigen-binding site and constant regions determining the mechanism of action.

Question 16

Which of the following is NOT one of the four cardinal signs of inflammation?

Accepted Answer

Numbness

Question 17

A patient with HIV is more susceptible to opportunistic infections because HIV primarily destroys which of the following?

Accepted Answer

Helper T cells, crippling the coordinated immune response

Question 18

Which of the following best describes the role of Natural Killer (NK) cells in immune defense?

Accepted Answer

They release perforins to create holes in target cell membranes, then secrete granzymes to induce apoptosis.

Question 19

Which of the following best describes the difference between cellular (cell-mediated) and humoral (antibody-mediated) immunity?

Accepted Answer

Cellular immunity uses lymphocytes to directly destroy foreign or diseased cells; humoral immunity uses antibodies to tag extracellular pathogens for destruction.

Question 20

Which of the following best defines an epitope (antigenic determinant)?

Accepted Answer

A specific region of an antigen molecule that stimulates an immune response

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