Question 1

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

Accepted Answer

They carry lymph from peripheral tissues back to the venous system, helping maintain fluid balance and alerting the immune system to infections.

Question 2

A patient presents with persistent swelling in her right leg following surgical removal of lymph nodes due to cancer. Which condition is most likely responsible for her symptoms, and what is a potential consequence?

Accepted Answer

Lymphedema; accumulation of interstitial fluid can lead to toxin buildup and increased risk of infection.

Question 3

Which of the following statements about lymphatic capillaries is CORRECT?

Accepted Answer

They originate as pockets, have larger diameters than blood capillaries, and possess one-way valves formed by overlapping endothelial cells.

Question 4

Which lymphocyte type is primarily responsible for antibody-mediated immunity, and what is their mechanism of action?

Accepted Answer

B cells; they differentiate into plasma cells that secrete antibodies targeting specific antigens.

Question 5

A patient receives a kidney transplant and is prescribed cyclosporin A (CsA). What is the primary immunological effect of this medication?

Accepted Answer

It suppresses helper T cell activity, reducing the risk of graft rejection while sparing suppressor T cells.

Question 6

Which of the following best explains why elderly individuals are at increased risk for infections and cancer?

Accepted Answer

Decreased thymic hormone production leads to fewer responsive T cells and reduced immune surveillance.

Question 7

Which of the following is a correct sequence for the flow of lymph from the lower limbs back to the bloodstream?

Accepted Answer

Lymphatic capillaries → lymphatic vessels → lumbar trunks → cisterna chyli → thoracic duct → left subclavian vein

Question 8

A child is exposed to the measles virus and develops immunity. Which type of immunity is this, and what is the immunological basis?

Accepted Answer

Naturally acquired active immunity; the child's immune system produces antibodies and memory cells in response to the infection.

Question 9

Which of the following best describes the process of antigen presentation?

Accepted Answer

Specialized cells engulf pathogens, process them, and display antigenic fragments bound to proteins on their plasma membrane.

Question 10

A patient experiences a rapid, severe allergic reaction after eating peanuts, resulting in widespread vasodilation and a dangerous drop in blood pressure. What is this condition called, and what is the underlying mechanism?

Accepted Answer

Anaphylactic shock; systemic release of histamine from mast cells causes peripheral vasodilation and circulatory collapse.

Question 11

Which of the following is NOT a function of the spleen?

Accepted Answer

Production of all classes of lymphocytes.

Question 12

Which antibody class is most abundant in the blood and is responsible for resistance against many viruses, bacteria, and bacterial toxins?

Accepted Answer

IgG

Question 13

A patient with type I diabetes has autoantibodies that attack insulin-producing cells in the pancreas. This is an example of which type of immune disorder?

Accepted Answer

Autoimmune disorder

Question 14

Which of the following mechanisms describes how antibodies enhance phagocytosis of pathogens?

Accepted Answer

Opsonization; antibodies coat the pathogen, making it easier for phagocytes to bind and engulf it.

Question 15

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

Accepted Answer

Memory B cells generated during the primary response rapidly differentiate into plasma cells upon re-exposure to the same antigen.

Question 16

Which of the following is a correct example of a nonspecific (innate) defense mechanism?

Accepted Answer

The acidic environment of the stomach destroys ingested pathogens.

Question 17

Which of the following best describes the role of interferons in the immune response?

Accepted Answer

They are released by virus-infected cells and stimulate the production of antiviral proteins in neighboring cells.

Question 18

A patient with HIV develops frequent infections and certain cancers. Which immune cells are primarily targeted by HIV, and what is the consequence?

Accepted Answer

Helper T cells; their destruction impairs both cell-mediated and antibody-mediated immune responses.

Question 19

Which of the following best defines chemotaxis in the context of immune defense?

Accepted Answer

The movement of phagocytes toward or away from chemical signals released by pathogens or damaged tissues.

The Lymphatic System and Immunity: ANP Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards