1st and 2nd line of defense

This system contains cells that help fight diseases

• immune system

• lymphatic system

Any microorganism that can cause disease

• pathogen

• antigen

• antibody

• virus

This line of defense forms a barrier that stops all "things" from getting into the body or blood

• 1st line defense

• 2nd line defense

• 3rd line defense

Which is NOT considered FIRST line of defense?

• White Blood Cells
• Skin
• Hair
• Mucous Membranes

What function does mucus play in the immune system?

• traps foreign particles from entering the body
• moistens food
• produces WBCs
• acts as a lubricant

How does immune system fight viruses?

• Immune system guards our body and when red blood cells which are the part of our immune system detect viruses in our body they kill the antigen or viruses by antibodies.
• Immune system guards our body and when 
  white blood cells which are the part of our immune system detect viruses in our body they kill the antigen or viruses by antibodies.
  
• Immune system guards our body and when 
  antibiotics which are the part of our immune system detect viruses in our body they kill the antigen.
• None of above 

Why do we say the SKIN is the FIRST line of defense?

• epidermis has sweat glands
• breaks in the skin result in infection
• epidermis provides a barrier and secretes chemicals to stop invacers
• there are no other forms of barrier defense

What is the body's first line of defense against infection by foreign organisms? 

• antibodies
• lymph nodes
• white blood cells
• the skin

Which is NOT considered a first line of defense?

• White Blood Cells
• Skin
• Hair
• Mucous Membranes

The skin is part of which line of defense?

• 1st
• 2nd
• 3rd