Question 1

Which of the following best describes a major function of the lymphatic system?

Accepted Answer

Returning excess interstitial fluid to the bloodstream

Question 2

How do lymphatic vessels differ structurally from blood vessels?

Accepted Answer

Lymphatic vessels contain valves to prevent backflow, while most arteries do not

Question 3

Which of the following correctly traces the pathway of lymph circulation through the body?

Accepted Answer

Blood capillaries → lymphatic capillaries → lymphatic vessels → lymph nodes → lymphatic trunks → collecting ducts → subclavian veins

Question 4

Which of the following is a primary lymphoid organ?

Accepted Answer

Thymus

Question 5

Which of the following best describes the role of surface barriers in immunity?

Accepted Answer

They act as the first line of defense by preventing pathogen entry

Question 6

Which cell type is primarily responsible for phagocytosis in innate immunity?

Accepted Answer

Macrophages

Question 7

Which plasma protein is most directly involved in the formation of the membrane attack complex (MAC) during innate immunity?

Accepted Answer

Complement proteins

Question 8

A patient presents with swelling in the lower limbs due to lymphatic obstruction. Which process is most directly impaired?

Accepted Answer

Return of interstitial fluid to the bloodstream

Question 9

Which of the following best describes the purpose of the inflammatory response?

Accepted Answer

To isolate and eliminate pathogens and initiate tissue repair

Question 10

Which of the following is a correct sequence of events in the inflammatory response?

Accepted Answer

Vasodilation → increased capillary permeability → phagocyte migration → tissue repair

Question 11

Which of the following best explains how fever is generated during an immune response?

Accepted Answer

Pyrogens reset the hypothalamic thermostat to a higher set point

Question 12

Which of the following is a function of the spleen in the lymphatic system?

Accepted Answer

Filtration of blood and removal of old erythrocytes

Question 13

Which of the following is NOT a function of lymph nodes?

Accepted Answer

Producing erythrocytes

Question 14

Which of the following best describes the role of interferons in innate immunity?

Accepted Answer

They signal neighboring cells to produce antiviral proteins

Question 15

A patient with a genetic defect in complement proteins would most likely experience which of the following?

Accepted Answer

Increased risk of bacterial infections

Question 16

Which of the following best explains why lymphatic capillaries are highly permeable?

Accepted Answer

They lack a basement membrane and have overlapping endothelial cells

Question 17

Which of the following scenarios best illustrates the application of innate immunity?

Accepted Answer

A cut on the skin becomes red, swollen, and warm after bacterial entry

Question 18

Which of the following is a key difference between lymphatic and blood capillaries?

Accepted Answer

Lymphatic capillaries are blind-ended, while blood capillaries form continuous loops

Question 19

Which of the following best describes the cellular composition of lymphatic tissue?

Accepted Answer

Contains large numbers of lymphocytes and macrophages

Question 20

A patient with a splenectomy (removal of the spleen) is at increased risk for which of the following?

Accepted Answer

Infections due to impaired filtration of blood-borne pathogens

The Lymphatic System and Immunity: Structure, Function, and Immune Response

Study Guide - Practice Questions