$$\text{Macrophage} + \text{Pathogen} \rightarrow \text{Phagocytosis} \rightarrow \text{Digestion of Pathogen}$$

$$\text{Antigen-presenting cell} \rightarrow \text{Antigen + MHC presentation} \rightarrow \text{Cytotoxic T cell activation}$$

Question 1

Which of the following best describes the function of the lymphatic capillaries as shown in the first image?

Accepted Answer

They collect excess tissue fluid and return it to the bloodstream.

Question 2

What is the primary function of the lymph nodes, as illustrated in the second image?

Accepted Answer

To filter lymph and remove microorganisms, debris, and abnormal cells.

Question 3

The spleen, shown in the third image, is responsible for which of the following functions?

Accepted Answer

Removing old and damaged red blood cells and storing blood temporarily.

Question 4

Which organ, depicted in the fourth image, is essential for the maturation of T lymphocytes?

Accepted Answer

Thymus gland

Question 5

The tissue shown in the fifth image is most likely from which lymphatic structure, and what is its primary function?

Accepted Answer

Tonsil; filtering food and air entering the throat

Question 6

Which of the following best describes the relationship between the lymphatic and cardiovascular systems as shown in the first image?

Accepted Answer

Lymphatic vessels drain excess tissue fluid and return it to the venous system.

Question 7

Based on the sixth image, which of the following is a correct pairing of immune system types and their components?

Accepted Answer

Innate defense: Phagocytes

Question 8

The seventh image illustrates the interferon mechanism. Which statement best describes the role of interferons in viral defense?

Accepted Answer

Interferons stimulate nearby cells to produce antiviral proteins, blocking viral reproduction.

Question 9

Which of the following equations best represents the process of phagocytosis by macrophages?

Accepted Answer

$$	ext{Macrophage} + 	ext{Pathogen} ightarrow 	ext{Phagocytosis} ightarrow 	ext{Digestion of Pathogen}$$

Question 10

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

Accepted Answer

Passive, artificially acquired immunity

Question 11

Which of the following best explains why antibiotics are ineffective against viral infections?

Accepted Answer

Viruses lack metabolic activity and do not possess the structures targeted by antibiotics.

Question 12

Which antibody class is most prevalent in the blood and can cross the placenta to protect the fetus?

Accepted Answer

IgG

Question 13

A person exposed to a pathogen for the second time experiences a rapid and robust immune response. Which cells are primarily responsible for this?

Accepted Answer

Memory cells

Question 14

Which of the following is a correct sequence for the activation of cytotoxic T cells?

Accepted Answer

$$	ext{Antigen-presenting cell} ightarrow 	ext{Antigen + MHC presentation} ightarrow 	ext{Cytotoxic T cell activation}$$

Question 15

Which of the following best describes the role of complement proteins in the immune response?

Accepted Answer

They mark invading microorganisms for destruction, enhance inflammation, and lyse pathogens.

Question 16

Which of the following is a real-world example of competitive exclusion by the human microbiota?

Accepted Answer

Resident bacteria in the gut deprive harmful bacteria of nutrients and attachment sites.

Question 17

Which of the following best describes the process of inflammation?

Accepted Answer

Injured cells release histamine, increasing blood flow and attracting phagocytes to dispose of debris and initiate repair.

Question 18

Which of the following equations best represents the agglutination of antigens by antibodies?

Accepted Answer

$$	ext{Antibody} + 	ext{Antigen} ightarrow 	ext{Antigen-antibody complex} ightarrow 	ext{Agglutination}$$

Question 19

Which of the following is a key difference between active and passive immunization?

Accepted Answer

Active immunization results in immune memory, while passive immunization does not.

The Immune System: Defense Mechanisms and the Lymphatic System

Study Guide - Practice Questions