immune system year 9

What are the smallest and simplest pathogens?

• virus

• fungi

• bacteria

What are organisms that are so small that they can only be seen through a microscope?

• germs

• pathogens

• antibodies

What is a combination of body defenses made up of cells, tissues, and organs that fight pathogens in the body?

• immunity

• immune system

• lymphocytes

What is the secondary circulatory system that helps the body fight pathogens and maintain its fluid balance?

• lymphatic system

• circulatory system

• blood vessels

What is a preparation of dead or weakened pathogens that is introduced into the body to cause an immune response?

• fungi

• vaccine

• antigens

What are the substances that send the immune system into action?

• antigens

• antibodies

• vaccines

What is any condition that interferes with the normal or proper functioning of the body or mind?

• disease

• antibiotics

• immunity

What is a disease that can be spread to a person from another person, an animal, or an object?

• cancer

• chronic disease

• communicable disease

What are simple one-celled organisms?

• bacteria

• virus

• fungi

What are specific proteins that attach to antigens, keeping them from harming the body?

• virus

• antibodies

• lymphocytes