Science: The Immune System Worksheet

Question 1

What is the main job of the immune system in the human body?

Accepted Answer

The main job of the immune system is to protect the body from harmful germs and other substances that can cause illness.

Question 2

Name two types of germs that can make people sick, and explain how they are different.

Accepted Answer

Two types of germs are bacteria and viruses. Bacteria are living single-celled organisms, while viruses are smaller particles that must enter living cells to reproduce.

Question 3

How does the skin help the immune system defend the body?

Accepted Answer

The skin helps the immune system by acting as a barrier that blocks many germs from entering the body.

Question 4

What role do white blood cells play in the immune system?

Accepted Answer

White blood cells help the immune system by finding, attacking, and destroying harmful germs and infected cells.

Question 5

Explain what inflammation is and why it can be helpful when you get a cut.

Accepted Answer

Inflammation is the body's response to injury or infection that can cause redness, swelling, heat, and pain. It is helpful because it brings immune cells to the injured area to fight germs and begin healing.

Question 6

What is a pathogen, and how is it related to disease?

Accepted Answer

A pathogen is a disease-causing germ or agent, such as a virus, bacterium, fungus, or parasite. Pathogens can make people sick when they enter the body and multiply or damage cells.

Question 7

Describe how antibodies help the body fight infection.

Accepted Answer

Antibodies are proteins made by the immune system that attach to specific germs. They help by marking germs for destruction or blocking them from harming cells.

Question 8

Why do vaccines help protect people from some diseases?

Accepted Answer

Vaccines help protect people because they train the immune system to recognize and respond to specific pathogens before a person gets seriously sick.

Question 9

A student says, "Antibiotics can cure the flu because the flu is caused by bacteria." Explain what is wrong with this statement.

Accepted Answer

This statement is wrong because the flu is caused by a virus, not bacteria. Antibiotics work against bacterial infections, but they do not kill viruses like the flu.

Question 10

How do fever and mucus help the body defend itself during illness?

Accepted Answer

Fever can slow the growth of some pathogens and help the immune system work more effectively. Mucus helps trap germs so they can be removed from the body.

Question 11

Compare innate immunity and adaptive immunity in one or two sentences.

Accepted Answer

Innate immunity is the body's fast, general defense against many kinds of threats. Adaptive immunity is a more specific response that targets particular pathogens and can create memory for future protection.

Question 12

List two healthy habits that help keep the immune system working well, and explain why each habit matters.

Accepted Answer

Two healthy habits are getting enough sleep and washing hands regularly. Sleep helps the body repair itself and support immune function, while handwashing removes germs before they can spread or enter the body.

Science: The Immune System

Science: The Immune System

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