Immune system

Which of the following are physical barriers that protect the body from pathogens? (Choose all that apply)

• Skin

• Stomach acid

• Mucus in the respiratory tract

• White blood cells

What does stomach acid do to protect the body? (Choose one)

• It helps digest food faster

• It kills harmful bacteria in food and drinks

• It stops viruses from growing inside the stomach

• It makes food healthier

How does mucus in the nose help protect the body? (Choose two)

• It traps dirt and germs

• It produces white blood cells

• It keeps airways clean

• It destroys bacteria with acid

What do white blood cells do to protect us from disease? (Choose three)

• They attack and destroy germs

• They produce antibodies

• They make our skin stronger

• They create antitoxins to stop harmful chemicals

How can we help our immune system stay strong? (Choose three)

• Eating healthy food

• Washing hands regularly

• Avoiding sleep

• Getting vaccinations

What do antibodies do? (Choose two)

• They help fight specific germs

• They break down food in the stomach

• They remember germs for future protection

• They create mucus