Why don't we usually get chickenpox twice?

Memory cells remember the virus

How do vaccines work?

They train the immune system safely

An immune overreaction to something harmless

Immune System Quiz With Answers: Test Your Knowledge

This immune system quiz covers skin and mucus barriers, white blood cells, antibodies, lymph nodes, fever, vaccines, memory cells and allergies. Test your knowledge with 10 questions on how the body defends itself against germs.

Start Immune System Quiz With Answers Quiz

🎯 Daily Trivia Challenge • 🧠 10 Questions • ⏱️ 150 Seconds

Question 1 / 10 Time: 150s

Barrier
What is the body's first line of defense?
Cells
Which cells fight infection?
Antibodies
What do antibodies do?
Eaters
Which white blood cells engulf germs?
Nodes
What are swollen glands in the neck often?
Fever
Why does the body get a fever?
Memory
Why don't we usually get chickenpox twice?
Vaccines
How do vaccines work?
Allergy
What is an allergy?
Organ
Which organ helps train T cells?

Explanations: answer key for all 10 questions

Q1: What is the body's first line of defense?
Answer: Skin and mucous membranes
They block germs from entering.
Q2: Which cells fight infection?
Answer: White blood cells
There are several types.
Q3: What do antibodies do?
Answer: Recognize and tag germs
B cells produce them.
Q4: Which white blood cells engulf germs?
Answer: Phagocytes
Their name means eating cells.
Q5: What are swollen glands in the neck often?
Answer: Lymph nodes fighting infection
They filter lymph fluid.
Q6: Why does the body get a fever?
Answer: To help fight infection
Higher temperatures slow some germs.
Q7: Why don't we usually get chickenpox twice?
Answer: Memory cells remember the virus
This is immunity.
Q8: How do vaccines work?
Answer: They train the immune system safely
They mimic infection without causing disease.
Q9: What is an allergy?
Answer: An immune overreaction to something harmless
Pollen and peanuts are common triggers.
Q10: Which organ helps train T cells?
Answer: Thymus
The T stands for thymus.

Immune System Quiz – The Body's Defense Force

The immune system protects the body from germs like bacteria, viruses, fungi and parasites. Its first defenses are physical barriers: skin, mucus, tears and stomach acid.

If germs get in, white blood cells attack. Some engulf invaders, others release chemicals and B cells make antibodies that tag germs for destruction. T cells coordinate responses and destroy infected cells. Lymph nodes act as checkpoints.

The immune system remembers past invaders, which is why vaccines work so well. Sometimes it overreacts, causing allergies, or mistakenly attacks the body, causing autoimmune diseases. Sleep, nutrition and vaccines help keep it strong.

What This Quiz Teaches

This quiz is for students learning about the immune system.

What the first defenses are
What antibodies do
Why fever happens
How vaccines work
What allergies are

Did You Know?

Babies get antibodies from their mothers.
The spleen filters blood.
Tonsils are part of the immune system.
Exercise supports immunity.
Antibiotics do not work on viruses.