Question 1

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

Accepted Answer

They absorb digested fats and deliver fatty lymph (chyle) to the blood.

Question 2

A patient has a blockage in the right lymphatic duct. Which region of the body would most likely experience impaired lymph drainage?

Accepted Answer

Right upper arm

Question 3

Which of the following statements about the spleen is CORRECT?

Accepted Answer

It stores breakdown products of red blood cells for later reuse.

Question 4

Which of the following is a unique feature of lymphatic capillaries compared to blood capillaries?

Accepted Answer

They have flaplike minivalves formed by overlapping endothelial cells.

Question 5

A child with a congenital absence of the thymus would most likely have a deficiency in which type of immune cell?

Accepted Answer

T lymphocytes

Question 6

Which of the following best explains why lymph flow is slower through a lymph node than through lymphatic vessels?

Accepted Answer

There are fewer efferent vessels than afferent vessels.

Question 7

Which of the following is NOT a function of the inflammatory response?

Accepted Answer

Directly produces antibodies against pathogens

Question 8

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

Accepted Answer

They warn neighboring cells to produce antiviral proteins.

Question 9

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

Accepted Answer

Reduced ability to lyse bacterial cells

Question 10

Which of the following is a correct sequence of events during phagocyte mobilization in response to tissue injury?

Accepted Answer

Leukocytosis → Margination → Diapedesis → Chemotaxis

Question 11

Which of the following best describes the function of the membrane attack complex (MAC) formed by complement proteins?

Accepted Answer

It forms pores in the target cell membrane, leading to cell lysis.

Question 12

Which of the following is a characteristic of the thymus that distinguishes it from other lymphoid organs?

Accepted Answer

It lacks follicles because it does not contain B cells.

Question 13

Which of the following is a function of Mucosa-associated Lymphoid Tissue (MALT)?

Accepted Answer

It protects mucosal surfaces from pathogen entry.

Question 14

Which of the following best explains why the lymphatic system is considered a 'one-way' system?

Accepted Answer

Lymph flows toward the heart and cannot flow backward due to valves.

Question 15

Which of the following is a correct statement about the role of B cells in immunity?

Accepted Answer

They produce plasma cells that secrete antibodies.

Question 16

A patient presents with swelling and pain after a local injury. Which chemical mediator is primarily responsible for increased capillary permeability and local edema?

Accepted Answer

Histamine

Question 17

Which of the following best describes the process of opsonization?

Accepted Answer

The coating of pathogens by antibodies or complement proteins to enhance phagocytosis.

Question 18

Which of the following is NOT a cardinal sign of acute inflammation?

Accepted Answer

Numbness

Question 19

Which of the following lymphoid organs is most active during youth and atrophies with age?

Accepted Answer

Thymus

Question 20

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

Accepted Answer

Contraction of cardiac muscle in lymphatic vessel walls

Lymphatic System and Innate Immunity: Structure and Function

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