2.2 Immunity and Feedback

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

 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

T cells are made in the___________

• bone marrow
• spleen
• thymus
• tonsiles

A vaccination

• Is a type of white blood cell that eats bacteria

• Protects your body via needle or capsule

• Causes your body to react as if it had met a pathogen

• Is made up of collagen, and can be in the form of gelatine

Doctors sometimes use a vaccine to prepare the body to defend itself against future infections. These vaccines most often contain

• antibodies

• antibiotics

• white blood cells

• weakened pathogens

What do memory cells do?

• Kills the virus
• Eats the virus
• Patrol the area and make the immune system work faster next time.
• Makes antibodies

 Following a vaccination, the white cells produce . . .

• antibiotics
• antibodies
• statins.
• toxins.

An immune response is primarily due to the body’s white blood cells recognizing

• a hormone imbalance

• abiotic organisms

• foreign antigens

• known antibiotics

What type of feedback loop is shown?

• Positive

• Neutral

• Negative

What type of feedback loop is shown?

• negative

• neutral

• positive