Question 1

Which of the following best describes the overall function of the lymphatic system?

Accepted Answer

To return interstitial fluid to the bloodstream and provide immune defense against pathogens

Question 2

Which structural feature allows lymphatic capillaries to absorb large molecules such as proteins and cellular debris from the interstitial space?

Accepted Answer

Overlapping endothelial cells that function as one-way mini-valves

Question 3

A patient has a blockage in the right lymphatic duct. Which region of the body is most likely to experience lymphedema as a result?

Accepted Answer

Right arm

Question 4

Which of the following best compares the lymphatic system to the vascular (blood) system?

Accepted Answer

The lymphatic system is a one-way system that returns fluid to the blood, while the vascular system is a two-way circuit

Question 5

Which of the following best describes the composition of lymph?

Accepted Answer

A clear fluid containing water, proteins, ions, and immune cells, but lacking red blood cells

Question 6

Lymph is transported through lymphatic vessels primarily by which mechanism?

Accepted Answer

Active contraction of smooth muscle in lymphatic vessel walls and skeletal muscle movement

Question 7

In a lymph node, where are B cells primarily located?

Accepted Answer

Cortex, within the germinal centers

Question 8

Which of the following best differentiates the function of T cells from B cells in the immune response?

Accepted Answer

T cells mediate cellular immunity by directly attacking infected cells, while B cells mediate humoral immunity by producing antibodies

Question 9

Which concept explains why a person who has recovered from chickenpox is usually immune to future infections by the same virus?

Accepted Answer

Immunological memory

Question 10

Which of the following is a primary lymphoid organ?

Accepted Answer

Thymus

Question 11

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

Accepted Answer

Impaired removal of old red blood cells and increased susceptibility to blood-borne infections

Question 12

Which of the following best describes the function of the thymus?

Accepted Answer

Site of T cell maturation and selection

Question 13

Which of the following structures is considered part of MALT (Mucosa-Associated Lymphoid Tissue)?

Accepted Answer

Tonsils

Question 14

Which of the following best defines GALT?

Accepted Answer

Gut-Associated Lymphoid Tissue

Question 15

Which structural component of an antibody determines its class (isotype)?

Accepted Answer

Constant region of the heavy chain

Question 16

Which immunoglobulin subclass is most abundant in blood and provides the majority of antibody-based immunity against pathogens?

Accepted Answer

IgG

Question 17

Which of the following best differentiates between antigens and antibodies?

Accepted Answer

Antigens are foreign molecules that trigger an immune response, while antibodies are proteins produced by B cells that bind to antigens

Question 18

A child is born with a genetic defect that prevents the formation of lymphatic capillaries. Which of the following is the most likely consequence?

Accepted Answer

Impaired absorption of dietary fats and severe tissue edema

Question 19

Which immunoglobulin is primarily responsible for mediating allergic reactions by binding to mast cells and basophils?

Accepted Answer

IgE

Question 20

A patient receives a vaccine containing an inactivated virus. Which immune system property ensures that the patient will mount a faster and stronger response upon future exposure to the live virus?

Accepted Answer

Immunological memory

The Lymphatic System and Immune Function: Structure, Components, and Roles

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