BIOS 255 EXAM 3 COMPLETE 3 LATEST VERSIONS
UPDATED 2024-2025 QUESTIONS WITH CORRECT
DETAILED ANSWERS ALREADY GRADED A+
BIOS 255 EXAM 3 VERSION A
What are the functions of the immune system? - CORRECT ANSWER✔✔Protect
the body from and fight off pathogens
Innate immunity - CORRECT ANSWER✔✔Immune defense mechanisms you are
born with
Non specific resistance
What is the first line of defense? - CORRECT ANSWER✔✔Physical and chemical
barriers
What are examples of physical and chemical barriers? - CORRECT ANSWER✔✔Skin
Mucous membranes
Sebum
Perspiration
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What is the second line of defense? - CORRECT ANSWER✔✔Inflammation
Interferon
Compliment
Fever
Nk cells
Phagocytosis
What is the third line of defense? - CORRECT ANSWER✔✔Adaptive immunity or
specific resistance
What are two parts of the third line of defense? - CORRECT ANSWER✔✔Cell
mediated immunity
Antibody mediated immunity
What are the two types of non phagocyte killing - CORRECT
ANSWER✔✔Granulocytes( neutrophils and eosinophils)and nk cells
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What are the granulocytes that don't use phagocytosis? - CORRECT
ANSWER✔✔Neutrophils bacteria
Eosinophils parasitic worms, allergies and inflammation
Both by means of chemical release
How do nk cells work? - CORRECT ANSWER✔✔Recognition and attachment
Secretion of performing and granzymes
Lysis and detachment
How Is the process of phagocytosis? - CORRECT ANSWER✔✔Chemotaxis
Adhesion
Engulfment
Formation of phagosome
Add digestive enzymes to vesicle with the pathogen killing the pathogen
Endocytosis of the residual body
What are the four cardinal signs of inflammation? - CORRECT
ANSWER✔✔redness, heat, swelling, pain
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What are pyrogens? - CORRECT ANSWER✔✔Cause a fever
What are the two types of pyrogens? - CORRECT ANSWER✔✔exogenous and
endogenous
Exogenous - CORRECT ANSWER✔✔Produced from outside of the cell
Endogenous - CORRECT ANSWER✔✔Released from body cells like neutrophils and
macrophages (ex. Interleukin I)
What are interferons? - CORRECT ANSWER✔✔interfere with viral infections of
host cells
What are complement proteins? - CORRECT ANSWER✔✔Cascade of proteins join
to form a membrane attach complex that lyses the membrane of the pathogen
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