About this Study Set
This study set covers Immunology through
18 practice questions.
Fundamental concepts of the human immune system, including cells, barriers, and immunity types. Every question includes the correct answer so you can learn as you go — pick any format above to get started.
Questions & Answers
Browse all 18 questions from the
Introduction to Immunology study set below.
Each question shows the correct answer — select a study format above to practice interactively.
1
Which organ system is responsible for protecting the body against pathogens like bacteria and viruses?
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A
Digestive system
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B
Immune system
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C
Circulatory system
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D
Respiratory system
2
What is the first line of defense that prevents pathogens from entering the human body?
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A
White blood cells
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B
Antibodies
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C
Skin
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D
Bone marrow
3
Which type of white blood cell produces antibodies to fight specific infections?
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A
B cells
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B
Red blood cells
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C
Platelets
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D
Nerve cells
4
What substance do vaccines introduce to the body to help it recognize and fight future infections?
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A
Active bacteria
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B
Weakened or dead pathogens
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C
Strong antibiotics
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D
Sugar water
5
What is the primary function of an antibody in the immune system?
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A
To digest food
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B
To carry oxygen
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C
To identify and neutralize pathogens
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D
To filter blood
6
Which protein-based substance is produced by the immune system to tag germs for destruction?
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A
Insulin
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B
Antibody
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C
Hemoglobin
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D
Enzyme
7
What do we call a weakened or dead form of a germ that trains the immune system?
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A
Antigen
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B
Antibody
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C
Vaccine
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D
Antibiotic
8
Which cells in the immune system are known as 'eaters' because they engulf and digest pathogens?
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A
Phagocytes
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B
Platelets
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C
Red blood cells
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D
Neurons
9
What is the term for a substance that the immune system recognizes as foreign and harmful?
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A
Nutrient
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B
Antigen
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C
Vitamin
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D
Mineral
10
Which organ is a key site for the production of white blood cells?
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A
Liver
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B
Heart
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C
Bone marrow
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D
Kidney
11
What is the purpose of a fever during an infection?
-
A
To digest pathogens faster
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B
To slow down pathogen reproduction
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C
To produce more red blood cells
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D
To increase body weight
12
What type of immunity is acquired after recovering from a disease or receiving a vaccine?
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A
Active immunity
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B
Passive immunity
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C
Innate immunity
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D
Primary immunity
13
Which body fluid contains enzymes that help kill bacteria before they enter the digestive tract?
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A
Saliva
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B
Sweat
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C
Bile
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D
Urine
14
What is the role of mucus in the respiratory tract?
-
A
To provide oxygen
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B
To trap dust and pathogens
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C
To digest food
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D
To cool the air
15
Which of these is considered a 'non-specific' immune defense?
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A
Antibody production
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B
T-cell activation
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C
Inflammation
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D
B-cell memory
16
Where do T cells mature before they are released into the body?
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A
Thymus
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B
Lungs
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C
Stomach
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D
Brain
17
What is the process called when the body surrounds a site of injury with increased blood flow and white blood cells?
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A
Digestion
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B
Inflammation
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C
Respiration
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D
Circulation
18
Which type of blood cell is specifically involved in the immune response?
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A
Erythrocytes
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B
Leukocytes
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C
Platelets
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D
Plasma cells
