immunity

Why is it necessary to have the flu shot every year?

• A person's antibodies level never declines after receiving the vaccine
• People only have passive immunity to the flu for one year
• The flu virus evolves quickly
• The flu virus remains unchanged from year to year

Which is an example of passive immunity?

• people being vaccinated against disease
• people taking vitamins to boost their immune response
• people receiving antibodies from their mothers before birth
• people producing antibodies against organisms that cause diseases they have had previosuly

Which best describes the relationship between antibodies and antigens?

• Antibodies are specific to one antigen
• Antigens are produced in response to antibodies
• One antibody can affect several different antigens
• Immunity develops when an antigen destroys an antibody.

How do vaccines help to fight infection?

• the body creates memory cells that stay in the blood to fight infection if they are exposed again
• the body creates brain cells that stay in the blood to fight infection if they are exposed again
• the body creates antibiotics that stay in the blood to fight infection if they are exposed again

What are pathogens?

• organisms that cause disease
• organisms that are not living 
• only viruses 
• Organisms that can be seen without a microscope

Antibodies are specific (acts on) one

• Antigen
• white blood cell
•  red blood cells
•  virus

Newborns can acquire ____ immunity through breast milk.

• specific
• passive
• active
• innate

The resistance to specific pathogens, or disease-causing agents is called _________.

• spleen
• lymphatic system
• anitbodies
• immunity

The resistance to a disease acquired as a result of exposure to the disease or agent:

• Active Immunity
• Cell-Mediated Immunity
• Passive Immunity
• Natural Immunity

Special proteins produced by the body to attack foreign invaders.

• antibodies
• antigen