Immune System

What is the body's first line (non-specific) of defense against infection by foreign organisms?

• antibodies

• lymph nodes

• white blood cells

• skin

After an initial infection, B-cells recognize the measles virus. How is this helpful in human immune response?

• The B-cells use this recognition to defend the body against other pathogens, such as bacteria.

• The B-cells more quickly recognize and respond to any other virus that invades the body.

• The B-cells produce antibodies more quickly if the measles virus is encountered again.

• The B-cells transfer this recognition to T-cells, which will then devour the viruses.

White blood cells are an important part of the human immune response. Two types of white blood cells, neutrophils and macrophages, act as phagocytes. Phagocytes perform which of the following functions in the human body?

• They produce antibodies.

• They bind to antigens and develop into plasma cells.

• They form a barrier against pathogens.

• They engulf (eat) and destroy bacteria.

Although vaccines cannot be used to treat a person who is sick, they can help to prevent infections. Vaccinations tell the body to create "memory cells", which will function later to create antibodies against certain pathogens. When a person is vaccinated, what are they injected with?

• antibodies to a disease bacterium.

• live, inactive viruses.

• weakened viruses or antigens from the virus

• blood from a person who has had the disease.

What is the main purpose of the immune system?

• support the body through bones and muscles

• get rid of waste from the body

• protect the body from pathogen

• move blood through the body

Vaccines stimulate the body to produce...

• antibodies

• antigens

• helper t-cells

• fever

Which one is a way the body defends against a pathogen?

• fever

• white blood cells

• stomach acid digesting

• all of these are correct

Pathogens are recognized by their...

• antigens

• antibodies

• killer t-cells

• B-cells

Antibiotics can be taken to help treat a viral infections.

• True

• False

Your body's second line of defense after your skin, it involves blood rushing to the site of a possible infection to bring white blood cells to the area to fight any pathogens is also known as:

• vaccine

• antibodies

• antigen

• inflammatory response