Immune System Review

The ... line of defense is the physical barrier that helps keep pathogens out of our bodies.

Show how phagocytes help in the immune response

This is an example of a chemical barrier (2nd line of defense).

• hair

• skin

• acid

• eyelid

The role of phagocytes is to .... pathogens.

Lymphocytes recognize proteins on the surface of a pathogen. What are these proteins called?

• phagocytes

• pathogen

• antigens

• antibodies

Lymphocytes produce .... when they detect pathogens.

Select the best definition for a "pathogen".

• an animal that can infect your body

• a microorganism that causes disease

• a microorganism that fights against disease

• none of the above

Draw a picture that shows the term "transmissible disease".

Why would babies require breastmilk from their mothers?

Active immunity usually provides .... immunity than passive immunity.

• short-term

• long-term

• fast-acting

• none of the above