Question 1

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

Accepted Answer

To return leaked fluid from blood vessels back to the blood and provide the anatomical basis for the body's defenses

Question 2

A patient has a blockage in their thoracic duct. Which of the following is the most likely consequence?

Accepted Answer

Accumulation of lymph in the lower limbs, leading to edema

Question 3

Which of the following statements about lymphatic capillaries is correct?

Accepted Answer

They are closed at one end and have highly permeable walls that allow proteins and large particles to enter.

Question 4

Which of the following best explains why lymph flow is slower through a lymph node than in afferent lymphatic vessels?

Accepted Answer

There are fewer efferent than afferent vessels, allowing time for lymphocytes and macrophages to function.

Question 5

A patient has their spleen removed (splenectomy) after trauma. Which of the following is a likely long-term consequence?

Accepted Answer

Increased risk of bacterial infections due to loss of lymphocyte proliferation and blood filtration

Question 6

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

Accepted Answer

Producing hormones that regulate blood pressure

Question 7

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

Accepted Answer

It is the site where T lymphocytes mature and become immunocompetent.

Question 8

Which of the following structures is part of the mucosa-associated lymphoid tissue (MALT) and helps guard the entryways against pathogens?

Accepted Answer

Palatine tonsils

Question 9

A patient presents with swollen cervical lymph nodes after a throat infection. What is the most likely explanation for this swelling?

Accepted Answer

Increased lymphocyte and macrophage activity in response to infection

Question 10

Which of the following best explains why lymphatic vessels are considered low-pressure vessels?

Accepted Answer

They rely on skeletal muscle contraction and pressure changes during breathing to move lymph.

Question 11

Which of the following equations best represents the relationship between hydrostatic pressure ($$P_{h}$$), osmotic pressure ($$P_{o}$$), and net filtration pressure ($$NFP) in $$capillary exchange?

Accepted Answer

$$NFP = P_{h} - P_{o}$$

Question 12

Which of the following is a key difference between diffuse and follicular lymphoid tissue?

Accepted Answer

Follicular lymphoid tissue contains tightly packed lymphocytes, while diffuse tissue consists of loosely arranged lymphoid cells and reticular fibers.

Question 13

A child is born without a thymus. Which of the following immune deficiencies would you expect?

Accepted Answer

Deficiency in T lymphocyte maturation

Question 14

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

Accepted Answer

They are clusters of lymphoid follicles in the small intestine that monitor intestinal bacteria and prevent the growth of pathogenic bacteria.

Question 15

Which of the following is a correct statement about the flow of lymph through the body?

Accepted Answer

Lymph flows from the tissues to the heart, moving through lymphatic vessels and nodes, and is eventually returned to the venous circulation.

Question 16

Which of the following best explains why lymph nodes are important in cancer metastasis?

Accepted Answer

They can trap cancer cells traveling in lymph, but may also serve as sites where cancer cells proliferate and spread to other parts of the body.

Question 17

A patient has a mutation that prevents the formation of valves in their lymphatic vessels. Which of the following is the most likely physiological consequence?

Accepted Answer

Lymph may flow backward, leading to edema and impaired immune function.

Question 18

Which of the following best describes the function of the spleen's white pulp?

Accepted Answer

It is involved in immune functions, containing lymphocytes that monitor the blood for pathogens.

Question 19

Which of the following is a correct statement about the development of lymphoid organs?

Accepted Answer

The thymus is an endodermal derivative, while the rest of the lymphoid organs derive from the mesenchyme.

Question 20

Which of the following best explains why tonsils are considered part of the immune system?

Accepted Answer

They educate, monitor, and strengthen the immune response by trapping pathogens entering through the mouth and nose.

The Lymphatic System and Lymphoid Organs and Tissues: Study Notes

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