Unit 2 - Lesson 1

Question 1

Pathogen

Answer 1

An organism, virus or protein that causes disease

Question 2

External Defenses

Internal Defenses

Answer 2

Skin, hair, nails, sweat and oil glands

Inflammation (swelling and redness) and fever

Question 3

Immune System

Answer 3

Made up of tissues and specialized white blood cells that recognize and attack foreign substances in the body

Question 4

Macrophage

Answer 4

A white blood cell that destroys pathogens by digesting them. They help start the body’s immune response to antigens

Antigen - a substance that stimulates a response by the immune system

Question 5

T cell

Answer 5

An immune system cell that coordinates the immune system and attacks many infected cells

Helper T cells - recognize the antigen and activate the killer T cells and the B cells
Killer T cells - attack infected body cells by attaching to the antigen

Question 6

B cells

Answer 6

Cells that Make antibodies that attach to specific antigens

Question 7

Antibody

Answer 7

A specialized protein that binds to a specific antigen to tag it for destruction

Question 8

Immunity

Answer 8

The ability to resist or recover from an infectious disease

Once the body has fought an infection, it produces Memory cells which remember a specific pathogen

Question 9

Vaccine

Answer 9

A substance prepared from killed or weakened pathogens that is introduced into the body to produce immunity
They let the body make memory cells

Question 10

External Defenses

Internal Defenses

Answer 10

Skin, hair, nails, sweat glands, oil glands

Fever, inflammation