Understanding the Immune System

What symptom did Ralphie's mother observe that indicated he was sick?

• A high temperature

• A runny nose

• A sore throat

• A cough

What is the primary purpose of the medicine Ralphie's mother gave him?

• To make him feel better instantly

• To help his body get well

• To make him sleep

• To stop him from going to school

What does Ms. Frizzle say the body knows a lot about when someone is sick?

• How to make food

• How to grow taller

• The detection and rejection of infection

• How to run faster

What did Ralphie realize could be the subject of their Broadcast Day show?

• The history of the Magic School Bus

• What's going on inside his body

• How to build a computer

• The best way to avoid school

How did the FNN news team first enter Ralphie's body to investigate his illness?

• Through a cut on his knee

• Through his ear

• Through his mouth and throat

• Through his nose

What gives blood its red color?

• White blood cells

• Platelets

• The clear liquid plasma

• Red blood cells

Which of the following are components of blood, as shown in the video?

• Red blood cells, white blood cells, and platelets

• Plasma, nerves, and muscles

• Bones, skin, and hair

• Only red blood cells

What is the primary function of white blood cells in the body?

• To carry oxygen

• To help clot blood

• To fight infections

• To make blood red

What type of microorganisms caused Ralphie's throat infection?

• Viruses

• Fungi

• Bacteria

• Protozoa

Which cells in the human body are responsible for fighting off infections by "eating" harmful invaders?

• Red blood cells

• White blood cells

• Platelets

• Nerve cells