Question 1

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

Accepted Answer

To return leaked fluid from tissues back to the blood and provide immune defense

Question 2

Which lymphatic duct drains lymph from the right upper arm, right side of the head, and right thorax?

Accepted Answer

Right lymphatic duct

Question 3

A blockage in the left groin prevents lymphatic drainage from the left leg, causing edema. Which lymphatic duct is most likely affected?

Accepted Answer

Thoracic duct

Question 4

Which of the following is NOT a method by which lymph is propelled through lymphatic vessels?

Accepted Answer

Active pumping by the heart

Question 5

Which type of lymphoid cell is primarily responsible for producing antibodies?

Accepted Answer

Plasma cells (derived from B lymphocytes)

Question 6

Which lymphoid organ is the site of T cell maturation?

Accepted Answer

Thymus

Question 7

What is the advantage of having fewer efferent than afferent vessels in a lymph node?

Accepted Answer

It allows lymph to remain in the node longer for more thorough filtration

Question 8

Which of the following is a major function of the spleen?

Accepted Answer

Destruction of old red blood cells and immune surveillance

Question 9

Which of the following structures is NOT considered a secondary lymphoid organ?

Accepted Answer

Thymus

Question 10

Which equation best represents the relationship between hydrostatic pressure ($P_{hydro}$), osmotic pressure ($P_{osm}$), and net filtration pressure ($NFP$) in capillary exchange?

Accepted Answer

$NFP = P_{hydro} - P_{osm}$

Question 11

Which of the following is a specialized lymphatic capillary found in the intestinal mucosa that absorbs dietary fats?

Accepted Answer

Lacteal

Question 12

Which lymphoid tissue is most associated with the mucosa of the respiratory and digestive tracts and provides protection against pathogens entering through these routes?

Accepted Answer

MALT (Mucosa-associated lymphoid tissue)

Question 13

Which cell type is most abundant in the germinal centers of lymphoid follicles?

Accepted Answer

B lymphocytes

Question 14

A patient presents with localized edema due to blocked lymphatic drainage. Which of the following best explains the physiological basis for this edema?

Accepted Answer

Failure to return interstitial fluid to the bloodstream via lymphatic vessels

Question 15

Which of the following is NOT a component of MALT?

Accepted Answer

Thymus

Question 16

Which of the following best describes the role of dendritic cells in lymphoid tissues?

Accepted Answer

They capture antigens and present them to T cells for activation

Question 17

Which of the following statements about lymphatic capillaries is TRUE?

Accepted Answer

They allow larger molecules and microorganisms to enter than blood capillaries

Question 18

Which of the following is a function of lymph nodes?

Accepted Answer

Filtration of microorganisms and debris from lymph

Question 19

Which lymphoid organ is most important for immune function in early childhood and decreases in size after puberty?

Accepted Answer

Thymus

Question 20

Which of the following best explains why immobilization after trauma can help speed healing in the affected area?

Accepted Answer

It keeps needed immune materials in the area for faster healing by reducing lymphatic and venous drainage

The Lymphatic System and Lymphoid Organs: Structure and Function

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