Question 1

Which of the following best describes the primary function of lymphatic capillaries as shown in the images?

Accepted Answer

They absorb dietary fats from the digestive tract and return excess interstitial fluid to the bloodstream.

Question 2

A patient presents with swelling in their lower limbs due to fluid accumulation. Which structure is most likely malfunctioning?

Accepted Answer

Lymphatic capillaries

Question 3

Which of the following statements about the thoracic duct is correct?

Accepted Answer

It drains lymph from the entire body except the right upper quadrant.

Question 4

What is the significance of the flaplike minivalves in lymphatic capillaries?

Accepted Answer

They allow interstitial fluid to enter the capillary but prevent its escape, ensuring one-way flow.

Question 5

Which of the following best explains why lymphatic vessels are structurally similar to veins?

Accepted Answer

Both contain valves to prevent backflow and rely on skeletal muscle contraction for movement of fluid.

Question 6

A blockage in the right lymphatic duct would most likely result in edema in which region?

Accepted Answer

Right upper limb and right side of the head and thorax

Question 7

Which of the following is a key difference between lymphatic capillaries and blood capillaries?

Accepted Answer

Lymphatic capillaries are closed at one end, while blood capillaries form continuous loops.

Question 8

Which of the following best describes the relationship between the lymphatic and cardiovascular systems as shown in the diagrams?

Accepted Answer

Lymphatic vessels return excess interstitial fluid to the venous system, maintaining blood volume.

Question 9

Which anatomical structure is responsible for filtering lymph before it returns to the bloodstream?

Accepted Answer

Lymph nodes

Question 10

If the thoracic duct is damaged during surgery, which of the following complications is most likely to occur?

Accepted Answer

Accumulation of lymph in the left side of the thorax, abdomen, and lower limbs

Question 11

Which of the following best explains why lymphatic drainage is essential for tissue health?

Accepted Answer

It prevents the accumulation of excess interstitial fluid, which would otherwise cause edema.

Question 12

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

Accepted Answer

Production of hormones for metabolism

Question 13

Which lymphatic structure is most closely associated with the absorption of fats from the digestive tract?

Accepted Answer

Lacteals

Question 14

Which of the following best describes the flow of lymph through the body?

Accepted Answer

Lymph flows from tissues into lymphatic capillaries, through lymphatic vessels, lymph nodes, lymphatic trunks, and finally into lymphatic ducts before entering the venous circulation.

Question 15

Which of the following would most likely result from a congenital absence of lymphatic capillaries in the lower limbs?

Accepted Answer

Chronic edema in the lower limbs

Lymphatic System and Immunity: Structure, Function, and Body Defenses

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