BIO 242 EXAM 3 Questions and 100% correct answers
|Graded A+ (2026/2027)
Which lines of defense would be considered nonspecific and innate?
First line of defense
Second line of defense
Differentiate between components of first and second line defense
FIRST:Physical and Chemical barriers
SECOND: phagocytosis, inflammation, fever, antimicrobial proteins
FLOD: lysozome
is secreted in tears and saliva
What human body region is protected by fatty acids, acidic pH, lactic acid, and tough cell
barrier with its own normal biota?
skin
The sweat doud on skin and saliva in the mouth attributed to what line of defense?
First line
Eosinophils
attack parasitic helminths
Basophils
- make up less than .5% of circulating WBCs
- granules contain histamine
When monocytes migrate from the blood out to the tissues, they are transformed by
inflammatory mediators to develop into________
Macrophages
Inflammation- Cardinal Signs
- Rubor: redness
- Calor: warmth
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, -Tumor: swelling
Dolor: pain
The third line of defense against foreign invaders can be described as having _______ and
_______
Specificity and Memory
A foreign molecule that causes a specific immune response is an ______
Antigen
___ cells are part of the humoral immunity and mature in the Bone Marrow
B cells
____ cells are part of the cell mediated immunity and mature in the thymyus
T cells
The most abundant class of antibodies in serum is
IgG
_____ cells secrete antibodies
Plasma
IgG
monomer= 80% highest number of antibodies
2 binding site
IgA
dimer= 13% of antigen
4,2 biding site
IgM
pentamer=6%
10 biding site
Example of natural active immunity
chicken pox infection, followed by lifelong immunity
Example of natural passive immunity
2|Page
|Graded A+ (2026/2027)
Which lines of defense would be considered nonspecific and innate?
First line of defense
Second line of defense
Differentiate between components of first and second line defense
FIRST:Physical and Chemical barriers
SECOND: phagocytosis, inflammation, fever, antimicrobial proteins
FLOD: lysozome
is secreted in tears and saliva
What human body region is protected by fatty acids, acidic pH, lactic acid, and tough cell
barrier with its own normal biota?
skin
The sweat doud on skin and saliva in the mouth attributed to what line of defense?
First line
Eosinophils
attack parasitic helminths
Basophils
- make up less than .5% of circulating WBCs
- granules contain histamine
When monocytes migrate from the blood out to the tissues, they are transformed by
inflammatory mediators to develop into________
Macrophages
Inflammation- Cardinal Signs
- Rubor: redness
- Calor: warmth
1|Page
, -Tumor: swelling
Dolor: pain
The third line of defense against foreign invaders can be described as having _______ and
_______
Specificity and Memory
A foreign molecule that causes a specific immune response is an ______
Antigen
___ cells are part of the humoral immunity and mature in the Bone Marrow
B cells
____ cells are part of the cell mediated immunity and mature in the thymyus
T cells
The most abundant class of antibodies in serum is
IgG
_____ cells secrete antibodies
Plasma
IgG
monomer= 80% highest number of antibodies
2 binding site
IgA
dimer= 13% of antigen
4,2 biding site
IgM
pentamer=6%
10 biding site
Example of natural active immunity
chicken pox infection, followed by lifelong immunity
Example of natural passive immunity
2|Page
