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 presents with swollen, tender lymph nodes in the cervical region following a throat infection. What is the most likely explanation for this finding?

Accepted Answer

The lymph nodes are overwhelmed by pathogens and are inflamed, a condition known as lymphadenitis.

Question 3

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

Accepted Answer

High-pressure pumping by the heart

Question 4

Which lymphoid organ is responsible for the maturation of T lymphocytes and is most active during childhood?

Accepted Answer

Thymus

Question 5

A cancer patient is found to have swollen but painless lymph nodes. What is the most likely explanation for this clinical finding?

Accepted Answer

The lymph nodes are infiltrated by metastasizing cancer cells, which typically do not cause pain.

Question 6

Which of the following statements about the spleen is CORRECT?

Accepted Answer

The spleen stores blood platelets and monocytes for release when needed.

Question 7

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

Accepted Answer

They form the stroma, a network that supports other cells in lymphoid organs.

Question 8

Which of the following is a unique feature of lymphatic capillaries that allows them to absorb larger molecules such as proteins and pathogens?

Accepted Answer

They possess overlapping endothelial cells that form one-way minivalves.

Question 9

Which of the following is TRUE regarding the circulation of lymph through a lymph node?

Accepted Answer

Lymph enters the node through afferent lymphatic vessels and exits through efferent vessels.

Question 10

Which of the following best explains why physical activity increases lymph flow?

Accepted Answer

Muscle contractions compress lymphatic vessels, propelling lymph toward the heart.

Question 11

Which of the following is a function of the white pulp of the spleen?

Accepted Answer

Immune surveillance and activation of lymphocytes

Question 12

Which of the following lymphoid tissues is most likely to encounter antigens entering through the digestive tract?

Accepted Answer

Peyer’s patches

Question 13

A patient has a congenital defect resulting in the absence of thymic epithelial cells. Which of the following consequences is most likely?

Accepted Answer

Impaired maturation of T lymphocytes

Question 14

Which of the following is a distinguishing feature of the thymus compared to other lymphoid organs?

Accepted Answer

Its stroma is made up of epithelial cells, not reticular fibers.

Question 15

Which of the following best describes the role of dendritic cells in lymphoid tissues?

Accepted Answer

They capture antigens and deliver them to lymph nodes, helping activate T cells.

Question 16

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 17

Which of the following lymphatic ducts drains lymph from the right upper arm and right side of the head and thorax?

Accepted Answer

Right lymphatic duct

Question 18

Which of the following best explains why lymph nodes are strategically located in the cervical, axillary, and inguinal regions?

Accepted Answer

These regions are sites where collecting lymphatic vessels converge into trunks, allowing efficient filtration of lymph from major body areas.

Question 19

Which of the following is a function of the medullary cords in the lymph node?

Accepted Answer

They contain B cells, T cells, and plasma cells involved in immune responses.

Question 20

Which of the following best describes the function of tonsillar crypts in the immune response?

Accepted Answer

They trap bacteria and particulate matter, allowing immune cells to become activated and build memory.

The Lymphatic System: Structure, Function, and Major Organs

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