Question 1

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

Accepted Answer

They return interstitial fluid and leaked plasma proteins to the bloodstream.

Question 2

Which lymphatic structure is responsible for absorbing dietary fats in the small intestine, and what is its specific name?

Accepted Answer

Lymphatic capillary; called a lacteal

Question 3

A patient undergoes surgery that removes several lymphatic vessels in the leg. What is the most likely physiological consequence?

Accepted Answer

Severe local edema due to impaired lymph drainage

Question 4

Which of the following is TRUE regarding the flow of lymph through a lymph node?

Accepted Answer

Lymph enters via afferent vessels, passes through sinuses, and exits via efferent vessels at the hilum.

Question 5

Which equation best represents the net movement of fluid from blood capillaries into tissues, contributing to lymph formation?

Accepted Answer

$$J_v = K_f \left[ (P_c - P_i) - \sigma (\pi_c - \pi_i) \right]$$

Question 6

Which of the following is a primary lymphoid organ, and what is its main function?

Accepted Answer

Thymus; site of T lymphocyte maturation and immunocompetence

Question 7

What is the effect of having more afferent than efferent lymphatic vessels in a lymph node?

Accepted Answer

It slows lymph flow, allowing more time for filtration and immune surveillance.

Question 8

Which cell type is responsible for producing antibodies in the lymphatic system?

Accepted Answer

Plasma cells derived from B lymphocytes

Question 9

Which of the following best describes the role of reticular connective tissue in lymphoid organs?

Accepted Answer

It provides a network-like support (stroma) for immune cells.

Question 10

Which lymphoid organ is the largest, and what are its two main histological components?

Accepted Answer

Spleen; white pulp and red pulp

Question 11

Which of the following is NOT a function of the spleen?

Accepted Answer

Production of insulin for glucose regulation

Question 12

Which of the following lymphoid tissues is found in the mucosa of the respiratory and digestive tracts and is important for preventing pathogen entry?

Accepted Answer

Mucosa-associated lymphoid tissue (MALT)

Question 13

Which of the following is a correct pairing of a lymphoid organ and its function?

Accepted Answer

Peyer's patches; destroy bacteria and generate memory lymphocytes in the intestine

Question 14

Which of the following statements about lymphatic capillaries is TRUE?

Accepted Answer

They are blind-ended vessels with high permeability.

Question 15

Which lymphatic trunk drains lymph from the lower limbs and pelvis?

Accepted Answer

Lumbar trunk

Question 16

Which of the following best explains why lymphatic vessels are more permeable than blood capillaries?

Accepted Answer

They have flap-like minivalves and loosely attached endothelial cells.

Question 17

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

Accepted Answer

Lymph node

Question 18

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

Accepted Answer

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

Question 19

Which of the following best describes the function of dendritic cells in the lymphatic system?

Accepted Answer

They capture antigens and deliver them to lymph nodes to help activate T cells.

Question 20

Which of the following is a plausible consequence of a thin capsule in the spleen?

Accepted Answer

Increased risk of rupture and hemorrhage following trauma

The Lymphatic System: Structure, Function, and Clinical Relevance

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