Question 1

Which of the following best describes the primary function of lymphatic capillaries in peripheral tissues?

Accepted Answer

They absorb excess interstitial fluid and return it to the venous system.

Question 2

A patient undergoes radical breast surgery and later develops swelling in her right arm. Which of the following best explains the physiological basis for this lymphedema?

Accepted Answer

Obstruction of lymphatic vessels impairs lymph drainage, causing accumulation of interstitial fluid.

Question 3

Which lymphatic duct is responsible for draining lymph from the left upper extremity and both lower extremities?

Accepted Answer

Thoracic duct

Question 4

Which of the following is NOT a characteristic of lymphatic capillaries?

Accepted Answer

They are found in avascular tissues such as the cornea.

Question 5

A child with a congenital absence of the thymus would most likely have a deficiency in which of the following cell types?

Accepted Answer

T lymphocytes

Question 6

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

Accepted Answer

It contains lymphocytes that attack antigens in the blood and produce antibodies.

Question 7

Which sequence correctly traces the flow of lymph from peripheral tissues back to the heart?

Accepted Answer

Lymph capillaries $$\rightarrow$$ lymphatic vessels $$\rightarrow$$ lymph nodes $$\rightarrow$$ lymphatic trunks $$\rightarrow$$ lymphatic ducts $$\rightarrow$$ subclavian vein $$\rightarrow$$ superior vena cava $$\rightarrow$$ right atrium

Question 8

Which of the following lymphocyte types is primarily responsible for antibody production?

Accepted Answer

B lymphocytes

Question 9

A patient with a splenic injury has impaired removal of old red blood cells and bacteria from the blood. Which region of the spleen is most likely damaged?

Accepted Answer

Red pulp

Question 10

Which of the following structures is NOT considered a lymphatic organ but is a lymphatic nodule?

Accepted Answer

Peyer’s patches in the ileum

Question 11

Which of the following best explains why lymph nodes are strategically located along lymphatic vessels?

Accepted Answer

They filter lymph and remove antigens before lymph returns to the bloodstream.

Question 12

Which of the following is a function of Natural Killer (NK) cells?

Accepted Answer

They attack foreign cells, cancer cells, and virus-infected body cells.

Question 13

A patient has an infection in the left foot. Through which lymphatic duct will the lymph from this region ultimately drain into the venous system?

Accepted Answer

Thoracic duct

Question 14

Which of the following best describes the function of thymosins produced by the thymus?

Accepted Answer

They promote the development and maturation of functional T cells.

Question 15

Which of the following is a key difference between lymphatic nodules and lymph nodes?

Accepted Answer

Lymphatic nodules lack a connective tissue capsule, while lymph nodes are encapsulated.

Question 16

Which of the following best explains why the spleen is particularly vulnerable to injury in abdominal trauma?

Accepted Answer

It is the largest mass of lymphatic tissue and is located just beneath the left rib cage.

Question 17

Which of the following best describes the role of tonsils in the immune system?

Accepted Answer

They are strategically located to protect against inhaled or ingested pathogens and produce lymphocytes and antibodies.

Question 18

Which of the following is the main collecting duct of the lymphatic system, and what regions does it drain?

Accepted Answer

Thoracic duct; drains the left side of the head, neck, chest, left upper extremity, and the entire body below the ribs.

Question 19

Which of the following best explains why lymphatic capillaries are able to absorb large molecules such as proteins from the interstitial space?

Accepted Answer

They have overlapping endothelial cells with gaps that allow large molecules to enter.

Question 20

Which of the following best describes the function of the mucosa-associated lymphoid tissue (MALT)?

Accepted Answer

It protects mucosal surfaces by aggregating lymphocytes to respond to pathogens entering through the GI, respiratory, urinary, and reproductive tracts.

The Lymphatic System and Immunity: Structure and Function

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