Line of Defense

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 pathogens
• move blood through the body

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

• Fever
• Stomach Acid digesting
• White Blood Cells fighing
• All of these are correct

 Like all other body systems, the immune system helps the body maintain homeostasis.  Which statement best describes how the immune system does this?  

• it protects other organs and tissues from infection and disease
• it breaks down food to provide cells with nutrients
• it gathers information through the senses and controls all other body systems
•  it transports oxygen and carbon dioxide

 Liz notices that shortly after cutting her arm accidentally the area around the cut is turning red and feeling hot.  Which immune system defense is Liz experiencing?  

• inflammation
• white blood cell clotting
• skin
• fever

Cells that ingest pathogens are

• plasma cells
• phagocytic cells
• helper T cells
• antibodies

What is the body's first line of defence against infection?

• Physical barriers

• White blood cells

• Blood plasma

• Red blood cells

Which of the following are examples of innate (non-specific) immunity?

• Skin forms a physical and antiseptic barrier to pathogens

• Leukocytes detect the antigens of the E.coli bacterium and produce antibodies

• Macrophages engulf bacterial cells at the site of infection

• The body produces large numbers of memory cells with specific antibodies

When is passive immunity developed?

• After a baby's first vaccination

• After a baby's first bacterial infection

• Before birth

• After a baby's first dose of antibiotics

What happens in the 3rd line of defence?

• immune cells such as B-cells and T-cells target specific antigens or foreign material

• Vaccines teach the body to make specific antibodies

• tissue swells and the bodies temperature rises in response to infection

• Physical barrier to prevent pathogens from entering the body

An agent that causes a disease is a...

• Pathogen

• Coronavirus

• Antigen

• Leukocyte