Question 1

Which of the following best describes the structural relationship between blood capillaries and lymphatic capillaries in tissues, as shown in the provided diagram?

Accepted Answer

Lymphatic capillaries are blind-ended tubes that collect excess tissue fluid from the interstitial space, running parallel but not continuous with blood capillaries.

Question 2

What is the primary function of the flaplike minivalves formed by overlapping endothelial cells in lymphatic capillaries?

Accepted Answer

To permit one-way entry of interstitial fluid into the lymphatic capillary, preventing backflow.

Question 3

Which lymphatic duct drains lymph from the right upper limb, right side of the head, and right thorax?

Accepted Answer

Right lymphatic duct

Question 4

A patient has a tumor blocking the thoracic duct. Which of the following regions would most likely experience lymphedema as a result?

Accepted Answer

Left lower limb

Question 5

Which of the following is NOT a function of the spleen?

Accepted Answer

Site of T cell maturation

Question 6

Which lymphoid organ is the site of T cell maturation and is most active during childhood?

Accepted Answer

Thymus

Question 7

Which of the following best explains why lymph nodes can become secondary cancer sites?

Accepted Answer

Metastasizing cancer cells can become trapped in lymph nodes, where they proliferate.

Question 8

Which of the following structures is responsible for absorbing digested fats and delivering chyle to the blood?

Accepted Answer

Lacteals

Question 9

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

Accepted Answer

High-pressure arterial pulsations within lymphatic vessels

Question 10

Which of the following statements about the thymus is TRUE?

Accepted Answer

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

Question 11

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

Accepted Answer

They form a network-like support (stroma) for immune cells.

Question 12

Which of the following is a distinguishing feature of lymphoid follicles (nodules) compared to diffuse lymphoid tissue?

Accepted Answer

Presence of tightly packed lymphoid cells and germinal centers

Question 13

Which of the following is a function of Peyer’s patches and the appendix?

Accepted Answer

Destroy bacteria before they breach the intestinal wall and generate memory lymphocytes

Question 14

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

Accepted Answer

There are fewer efferent lymphatic vessels than afferent vessels, causing stagnation.

Question 15

Which of the following is TRUE regarding the development of lymphoid organs?

Accepted Answer

The thymus develops from endoderm as an outgrowth of the pharynx.

Question 16

Which of the following is a correct pairing of lymphoid organ and its primary function?

Accepted Answer

Spleen – cleanses blood and removes aged erythrocytes

Question 17

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

Accepted Answer

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

Question 18

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

Accepted Answer

It lacks lymphoid follicles and B cells.

Question 19

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

Accepted Answer

It enhances the milking action of skeletal muscles, propelling lymph through lymphatic vessels.

Question 20

Which of the following is a risk associated with the structure of tonsillar crypts?

Accepted Answer

They allow bacteria to enter and be destroyed, but also risk infection.

Lymphatic System and Lymphoid Organs: Structure, Function, and Clinical Aspects

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