Question 1

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

Accepted Answer

They return interstitial fluid and leaked plasma proteins back to the bloodstream.

Question 2

Lymphatic vessels are more permeable than blood capillaries. Which of the following is a consequence of this increased permeability?

Accepted Answer

They can take up larger molecules and particles, including pathogens and cancer cells.

Question 3

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

Accepted Answer

High-pressure arterial pulsations

Question 4

Why is the lymphatic system considered a 'low-pressure' system similar to veins?

Accepted Answer

It contains valves to prevent backflow and relies on external forces for propulsion.

Question 5

Which of the following is a primary lymphoid organ?

Accepted Answer

Thymus

Question 6

What is the main role of lymph nodes in the immune response?

Accepted Answer

They filter lymph and activate lymphoid cells to mount immune responses.

Question 7

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

Accepted Answer

B cells

Question 8

A patient presents with swollen, tender lymph nodes (buboes). What is the most likely explanation for this clinical finding?

Accepted Answer

The lymph nodes are overwhelmed by what they are trying to destroy, such as microorganisms.

Question 9

Which of the following best describes the difference between innate and adaptive immune responses in the lymphatic system?

Accepted Answer

Innate responses are non-specific and present at birth, while adaptive responses are specific and develop after exposure.

Question 10

Which of the following is a function of the spleen as a secondary lymphoid organ?

Accepted Answer

It filters blood and helps initiate immune responses to blood-borne antigens.

Question 11

If the lymphatic system fails to return interstitial fluid to the bloodstream, which condition is most likely to occur?

Accepted Answer

Edema (swelling) due to fluid accumulation in tissues

Question 12

Which of the following best explains why lymph nodes have fewer efferent than afferent vessels?

Accepted Answer

To allow lymphoid cells more time to filter and respond to pathogens

Question 13

Which of the following is TRUE regarding the movement of lymph in the body?

Accepted Answer

Lymph flows in a one-way system, always toward the heart.

Question 14

Which cell type is part of both innate and adaptive immunity and can directly attack abnormal cells?

Accepted Answer

Natural Killer (NK) cells

Question 15

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

Accepted Answer

Afferent vessel → cortex → medulla → efferent vessel

Question 16

Which of the following best describes the role of tonsils as secondary lymphoid organs?

Accepted Answer

They guard the entrance to the respiratory and digestive tracts, trapping pathogens.

Question 17

A cancer cell enters the lymphatic system. What is a possible consequence?

Accepted Answer

The cancer cell may be trapped and destroyed in a lymph node, or may spread to other parts of the body.

Question 18

Which of the following equations best represents the net movement of interstitial fluid into lymphatic capillaries?

Accepted Answer

$$J_{lymph} = (P_{interstitial} + \pi_{interstitial}) - (P_{lymph} + \pi_{lymph})$$

Question 19

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

Accepted Answer

Producing hormones for metabolism

Question 20

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

Accepted Answer

It enhances the skeletal muscle pump, which propels lymph through vessels.

The Lymphatic System: Structure, Function, and Immune Roles

Study Guide - Practice Questions