+
Related Flashcards
Related Topics
Cards In This Set
| Front | Back |
|
External barriers (non specific resistance)
|
Defends against invasion of pathogens
|
|
Pathogens
|
Disease-producing agents that include infectious organisms, toxic chemicals and radiation
|
|
Human environment for pathogens
|
Human body harbors billions of bacteria because homeostasis provides ideal temperature, moisture and PH nutrients for microbial life
|
|
___________ and ____________ are first line of defense against pathogens
|
Skin and mucous membranes
|
|
Skin=
|
Too dry and nutrient weak for microbes to survive
|
|
Epidermal cells and keratin
|
Provide mechanical mechanical barriers against microbes
|
|
Antimicrobial chemicals and lactic acid
|
Come from sweat and form coating over skin
|
|
Sebaceous glands
|
Secrete sebum to form protective film over skin
|
|
Mucous membranes
|
Line body cavities that are exposed to the exterior, secretes mucous that traps microbes
|
|
Areolar connective tissue
|
Contains hyaluronic acid which gives it thick, sticky consistency which make it hard for microbes to penetrate them
|
|
Lacrimal apparatus
|
Secrete tears to prevent microbes from infecting eyeballs
|
|
Saliva
|
Dilutes the number of microorganisms and washes them from mouth and teeth
|
|
Sweat glands
|
Produce perspiration to flush microorganisms from the skin
|
|
Mucous, tears, saliva, and perspiration contain:
|
Lysozomes
|
|
Lysozomes
|
Dissolve bacterial walls
|
