1.Surface Barriers

• The first line of defence against infectious disease are? (2 points)

Skin

• What does the skin protects?
• What are the regions of the skin's like?
• What does it secrete and why?
• The skin also secrete what two acids?

Mucous Membranes

• What structure does it protect?
• What is the region like? What does it consists of and what does it release and why?
• What chemical defense does it contain?
• What does ciliated mean?
• Why may mucuous membranes be ciliated?

Overview of Physical and Chemical Surface Barriers

2.Clotting

• Cuts in the skin are sealed by?
• What are blood cloths?
• What is clotting a mechanism of?