Body defences

Question 1

First line of defence

Answer 1

Skin, and mucous membranes

Question 2

Normal Flora

Answer 2

• micro organisms that have adapted to living on the skin and other parts of the body and are present in areas like hair follicles and pores.
• Don’t usually cause disease
• prevent other microorganisms from growing out of control on the skin surface.

Question 3

Transient Flora

Answer 3

• microorganisms that are picked up and put on other surfaces
• more likely to cause infection or illness

Question 4

Mucous membranes

Answer 4

Line cavities that communicate with outside such as gastrointestinal tract

Question 5

Secretions

Answer 5

• Tears, saliva, sweat and vaginal secretions contain lysozyme
• stomach acid has a pH level of 2 making it very acidic so it can destroy most micro organisms
• Lactoferrin is found in the saliva and breast milk, it inhibits the growth of some microorganisms

Question 6

a lysozyme is

Answer 6

an antibacterial enzyme