2025, Ted Ed, Understanding the Immune System

What is the name of the body system that defends you against infection, illness, and disease?

• nervous system

• immune system

• endocrine system

• excretory system

The immune system relies on millions of defensive __________ blood cells, also known as leukocytes.

• red

• white

• strong

• muscle

Where are white blood cells produced?

• in bone marrow

• in blood

• in the brain

• in the pancreas

How long does it take your body's immune response to respond after detecting "invaders."

• weeks

• days

• hours

• minutes

The human body has just one type of leukocyte.

• true

• false

The immune system does not play a role in keeping your body healthy.

• true

• false