Question 1

Which of the following best describes the primary function of lymphatic capillaries?

Accepted Answer

They collect excess interstitial fluid and transport it to larger lymphatic vessels.

Question 2

A patient presents with severe swelling in the lower limbs after a parasitic infection. Which lymphatic function is most likely impaired?

Accepted Answer

Prevention of edema by returning excess tissue fluid to the bloodstream

Question 3

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

Accepted Answer

Lymphatic capillary → Lymphatic vessel → Lymph node → Lymphatic vessel → Lymphatic trunk → Collecting duct → Subclavian vein

Question 4

Which lymphatic organ is responsible for the maturation of T lymphocytes and secretes hormones called thymosins?

Accepted Answer

Thymus

Question 5

A blockage in the thoracic duct would most directly affect lymph drainage from which region?

Accepted Answer

Left upper limb and both lower limbs

Question 6

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

Accepted Answer

Synthesis of plasma proteins for blood clotting

Question 7

Which of the following best describes the role of the spleen in the lymphatic system?

Accepted Answer

It filters blood, removes old red blood cells, and contains white and red pulp.

Question 8

Which of the following mechanisms does NOT contribute to the movement of lymph through lymphatic vessels?

Accepted Answer

Pumping action of the heart

Question 9

A patient with a genetic defect in the complement system would most likely have problems with which aspect of immunity?

Accepted Answer

Activation of inflammation and lysis of pathogens

Question 10

Which immunoglobulin is primarily responsible for the secondary immune response and is the main antibody found in blood?

Accepted Answer

Immunoglobulin G (IgG)

Question 11

A child receives a vaccine containing an attenuated virus. Which type of immunity is being induced?

Accepted Answer

Artificially acquired active immunity

Question 12

Which of the following best explains why tissue fluid enters lymphatic capillaries?

Accepted Answer

Tissue fluid pressure increases, opening flaplike valves between epithelial cells.

Question 13

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

Accepted Answer

Adaptive immunity involves memory cells, while innate immunity does not.

Question 14

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

Accepted Answer

A macrophage phagocytizes a pathogen, processes its antigens, and displays them on its surface with MHC proteins.

Question 15

Which of the following is a function of Peyer’s patches in the MALT?

Accepted Answer

They initiate immune responses against ingested substances.

Question 16

A patient with an autoimmune disorder is most likely experiencing which of the following?

Accepted Answer

Immune system attacking the body’s own tissues

Question 17

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

Accepted Answer

They secrete cytokines that stimulate B cell proliferation and antibody production.

Question 18

Which of the following is a direct result of the activation of the complement system?

Accepted Answer

Opsonization, chemotaxis, and lysis of pathogens

Question 19

A person with a deficiency in IgA would most likely have increased infections in which area?

Accepted Answer

Exocrine gland secretions such as saliva and tears

Question 20

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

Accepted Answer

It increases the rate of phagocytosis and inhibits the growth of some pathogens.

The Lymphatic System and Immunity: Structure, Function, and Defense Mechanisms

Study Guide - Practice Questions