IMMUNE SYSTEM I NON-SPECIFIC DEFENSE

1
IMMUNE SYSTEM INON-SPECIFIC DEFENSE

• PP. 957-960

2
FUNCTION

• Fights pathogens to prevent infections and
  disease
• Works with the lymphatic system (collects fluid
  and returns it to the blood)

3
KOCHS POSTULATES

• Study page 957

4
STRUCTURES

• Bone marrow produces blood cells
• Lymphocytes wbc
• Thymus mature wbc
• Lymph nodes stores wbc
• Spleen contains wbc that clean out pathogens as
  blood filters through

5
WHITE BLOOD CELLS (wbc)

• Also called leukocytes
• Type of wbc present indicates specific disease or
  have specific job
• IE. Neutrophils respond to bacteria

6
INITIATING THE IMMUNE SYSTEM

• pathogens cause disease
• - viruses protein shell containing DNA or
• RNA
• - bacteria, protists, fungi

7
FIRST LINE OF DEFENSE

• Skin block entry
• mucous membranes trap pathogens and move them
  out of the body
• stomach acids destroys pathogens

8
(No Transcript)
9
SECOND LINE OF DEFENSE

• Inflammatory response
• 1. Injured cells release a chemical
  signal
• called histamine to increase blood
  flow to
• area
• 2. platelets cause clotting trapping
  pathogens
• 3. Area swells, becomes warm, and
• macrophages/phagocyte (wbc) move in
  and
• engulf bacteria

10

• interferons enzymes that stop virus protein
  production
• fever increase activity of wbc