Question 1

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

Accepted Answer

They collect excess interstitial fluid and plasma proteins and return them to the blood.

Question 2

If lymphatic vessels fail to pick up excess tissue fluid, which condition is most likely to occur?

Accepted Answer

Edema

Question 3

Which of the following statements about lymphatic capillaries is TRUE?

Accepted Answer

Their walls overlap to form flaplike minivalves that allow interstitial fluid to enter.

Question 4

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

Accepted Answer

Right lymphatic duct

Question 5

Lymphatic vessels are similar to veins in which of the following ways?

Accepted Answer

They are thin-walled and have valves to prevent backflow.

Question 6

Which mechanism does NOT aid in the transport of lymph through lymphatic vessels?

Accepted Answer

Active pumping by the heart

Question 7

Which harmful materials are filtered by lymph nodes before lymph is returned to the blood?

Accepted Answer

Bacteria, viruses, cancer cells, and cell debris

Question 8

What is the role of macrophages within lymph nodes?

Accepted Answer

They engulf and destroy foreign substances such as bacteria and viruses.

Question 9

Which lymphoid organ is responsible for filtering blood and destroying worn-out blood cells?

Accepted Answer

Spleen

Question 10

Which organ produces thymosin to program lymphocytes?

Accepted Answer

Thymus

Question 11

Which of the following is NOT a function of the inflammatory response?

Accepted Answer

Increases blood pressure throughout the body

Question 12

During the inflammatory response, what is the process called when neutrophils squeeze through capillary walls to reach sites of inflammation?

Accepted Answer

Diapedesis

Question 13

Which type of immunity targets virus-infected cells, cancer cells, and cells of foreign grafts?

Accepted Answer

Cellular (cell-mediated) immunity

Question 14

Which of the following is an example of passive humoral immunity that is naturally acquired?

Accepted Answer

Antibodies passing from mother to fetus via placenta

Question 15

A patient receives an injection of gamma globulin after exposure to hepatitis. What type of immunity is this?

Accepted Answer

Passive, artificially acquired

Question 16

Which disorder results from the immune system attacking the body's own tissues due to loss of self-tolerance?

Accepted Answer

Autoimmune disease

Question 17

Which of the following is a correct sequence for the process of the inflammatory response?

Accepted Answer

Neutrophils migrate to inflammation site, squeeze through capillary walls by diapedesis, gather at injury site by positive chemotaxis

Question 18

Which of the following equations best represents the relationship between fluid movement and pressure in lymphatic capillaries?

Accepted Answer

$$P_{outside} \u003e P_{inside}$$, minivalves open, fluid enters$

Question 19

Which lymphoid organ is most active during youth and is responsible for programming lymphocytes?

Accepted Answer

Thymus

Question 20

Which of the following is a function of Peyer's patches in the intestine?

Accepted Answer

Capturing and destroying bacteria in the intestine

Chapter 20: The Lymphatic System and Body Defenses

Study Guide - Practice Questions