Question 1

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

Accepted Answer

They collect excess fluid from interstitial spaces and return it to the blood.

Question 2

Lymphatic capillaries are highly permeable due to which structural feature?

Accepted Answer

Minivalves formed by overlapping endothelial cells

Question 3

Which sequence correctly traces the path of fluid from the tissues back to the bloodstream via the lymphatic system?

Accepted Answer

Arteries → blood capillaries → lymphatic vessels → subclavian vein

Question 4

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

Accepted Answer

Delivering oxygen directly to tissues

Question 5

The right lymphatic duct drains lymph from which region of the body?

Accepted Answer

Right upper arm and right side of the head and thorax

Question 6

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

Accepted Answer

High-pressure pumping by the heart

Question 7

What is the main structural difference between lymphatic capillaries and blood capillaries?

Accepted Answer

Lymphatic capillaries are blind-ended and have overlapping endothelial cells forming minivalves

Question 8

Which of the following is a primary lymphoid organ?

Accepted Answer

Thymus

Question 9

Which cell type is responsible for producing the reticular fibers that form the stroma of lymphoid organs?

Accepted Answer

Reticular cells

Question 10

Why does lymph tend to stagnate inside lymph nodes?

Accepted Answer

There are fewer efferent lymphatic vessels than afferent lymphatic vessels.

Question 11

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

Accepted Answer

Site where immune function occurs, containing mostly lymphocytes on reticular fibers

Question 12

Which of the following is NOT a component of MALT (mucosa-associated lymphoid tissue)?

Accepted Answer

Thymus

Question 13

A patient with a thymus that has atrophied after adolescence would most likely experience which of the following?

Accepted Answer

Impaired maturation of T lymphocytes

Question 14

Which of the following best explains why a sedentary lifestyle can lead to swelling in the lower extremities?

Accepted Answer

Reduced skeletal muscle contraction decreases lymphatic return, causing fluid accumulation in tissues.

Question 15

Which of the following is a secondary lymphoid organ where mature lymphocytes first encounter antigens?

Accepted Answer

Lymph node

Question 16

Which of the following statements about lymph transport is correct?

Accepted Answer

Lymph is propelled by skeletal muscle contraction and thoracic pressure changes.

Question 17

Which of the following best describes the role of macrophages in lymph nodes?

Accepted Answer

They phagocytize foreign substances and help activate T cells.

Question 18

Which of the following is a correct statement about the structure of lymphoid follicles?

Accepted Answer

They are solid, spherical bodies containing tightly packed lymphoid cells and reticular fibers.

Question 19

Which of the following best explains why the thoracic duct is important in the lymphatic system?

Accepted Answer

It drains lymph from the majority of the body into the venous circulation.

Question 20

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

Accepted Answer

Site where old blood cells and bloodborne pathogens are destroyed

The Lymphatic System: Structure, Function, and Clinical Relevance

Study Guide - Practice Questions