Question 1

Which of the following best describes the primary function of the lymphatic system?

Accepted Answer

To return interstitial fluid and leaked plasma proteins back to the blood

Question 2

A patient has a blockage in their right lymphatic duct. Which of the following regions would most likely experience impaired lymph drainage?

Accepted Answer

Right upper arm

Question 3

Which of the following statements about lymphatic capillaries is correct?

Accepted Answer

They are highly permeable and can take up proteins, cell debris, and pathogens

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 patient has a splenectomy (removal of the spleen). Which of the following consequences is most likely?

Accepted Answer

Impaired ability to cleanse blood of old erythrocytes and platelets

Question 6

Which of the following best explains why lymph flows in only one direction, toward the heart?

Accepted Answer

Lymphatic vessels have valves that prevent backflow

Question 7

Which of the following is NOT a function of lymph nodes?

Accepted Answer

Producing erythrocytes for the circulatory system

Question 8

Which of the following best describes the role of macrophages in lymphoid tissues?

Accepted Answer

They phagocytize foreign substances and help activate T cells

Question 9

A patient presents with swelling in the lower left leg. Which lymphatic structure is most likely blocked?

Accepted Answer

Thoracic duct

Question 10

Which of the following is a key difference between the thymus and other lymphoid organs?

Accepted Answer

The thymus lacks B cells and functions strictly in T lymphocyte maturation

Question 11

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

Accepted Answer

Pumping action of the heart

Question 12

Which of the following best describes the function of the white pulp in the spleen?

Accepted Answer

Site of immune function involving lymphocytes

Question 13

Which of the following is a correct sequence for the flow of lymph from the tissues back to the bloodstream?

Accepted Answer

Lymphatic capillaries → collecting lymphatic vessels → lymphatic trunks → lymphatic ducts → subclavian veins

Question 14

A child with a congenital absence of tonsils is likely to have increased susceptibility to which of the following?

Accepted Answer

Infections entering through the respiratory and digestive tracts

Question 15

Which of the following best describes the function of Peyer's patches in the small intestine?

Accepted Answer

They destroy bacteria and generate memory lymphocytes

Question 16

If a person has a mutation that prevents the formation of lymphatic valves, which of the following is the most likely consequence?

Accepted Answer

Lymph may flow backward, leading to tissue swelling (edema)

Question 17

Which of the following equations best represents the approximate daily volume of interstitial fluid returned to the blood by the lymphatic system?

Accepted Answer

$$3\ 	ext{L/day}$$

Question 18

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

Accepted Answer

Physical activity enhances the milking action of skeletal muscles, which propels lymph

Question 19

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

Accepted Answer

Destruction of old blood cells and bloodborne pathogens

Question 20

A patient is diagnosed with a deficiency in B lymphocytes. Which of the following immune responses would be most directly impaired?

Accepted Answer

Production of antibodies

Lymphatic System: Structure, Function, and Components

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