Question 1

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

Accepted Answer

They collect interstitial fluid and return it to the bloodstream.

Question 2

A patient presents with severe swelling in the lower limbs after traveling to a tropical region. Which condition is most likely responsible, and what is the underlying cause?

Accepted Answer

Elephantiasis caused by parasitic roundworms blocking lymphatic vessels.

Question 3

Which lymphatic structure is responsible for draining lymph from the right upper arm and the right side of the head and thorax?

Accepted Answer

Right lymphatic duct

Question 4

What is the main function of the white pulp in the spleen?

Accepted Answer

Immune surveillance and lymphocyte proliferation

Question 5

Which of the following cells is primarily responsible for producing antibodies?

Accepted Answer

Plasma cells

Question 6

A biopsy of a lymph node reveals a large number of actively dividing B cells in the germinal centers. In which region of the lymph node are these cells primarily located?

Accepted Answer

Cortex

Question 7

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

Accepted Answer

Active pumping by the heart

Question 8

Which of the following best explains why lymph flow through a lymph node is slow?

Accepted Answer

There are fewer efferent vessels than afferent vessels.

Question 9

Which lymphoid organ is the site of T lymphocyte maturation and does not directly fight antigens?

Accepted Answer

Thymus

Question 10

A patient with a history of recurrent bacterial infections is found to have a deficiency in dendritic cells. Which function is most likely impaired?

Accepted Answer

Activation of T cells by presenting antigens

Question 11

Which of the following is NOT a function of the lymphatic system?

Accepted Answer

Production of lymph

Question 12

Which of the following best describes the role of Peyer’s patches in the small intestine?

Accepted Answer

They destroy bacteria and generate memory lymphocytes.

Question 13

A patient is diagnosed with Hodgkin’s disease. Which of the following symptoms is most likely to be present?

Accepted Answer

Swollen lymph nodes, fatigue, and night sweats

Question 14

Which of the following best describes the structure of lymphatic capillaries?

Accepted Answer

They are blind-ended tubes with overlapping endothelial cells forming flaplike minivalves.

Question 15

Which of the following is a function of the red pulp in the spleen?

Accepted Answer

Destruction of worn-out red blood cells and bloodborne pathogens

Question 16

Which of the following best describes the function of tonsillar crypts?

Accepted Answer

They trap and destroy bacteria and particulate matter.

Question 17

Which of the following equations best represents the volume of lymph returned to the bloodstream per day?

Accepted Answer

$$V_{lymph} = 3\ 	ext{L/day}$$

Question 18

Which of the following best describes the role of reticular cells in lymphoid organs?

Accepted Answer

They produce the stroma that supports other cells.

Question 19

Which of the following is the correct sequence of lymph flow through a lymph node?

Accepted Answer

Afferent vessel → subcapsular sinus → medullary sinus → efferent vessel

Question 20

Which of the following best describes the function of MALT (mucosa-associated lymphatic tissue)?

Accepted Answer

It protects passageways open to the exterior from foreign matter.

The Lymphatic System: Structure, Function, and Clinical Significance

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