1. \"Barrier defense\" of the immune system refers to: A.) Cytokine production b
ID: 225530 • Letter: 1
Question
1. "Barrier defense" of the immune system refers to:
A.) Cytokine production by immune cells
B.) Phagocytosis of microbes by innate immune cells
C.) Natural protection by skin and mucosal surfaces of the body
D.) Antibody secretion by lymphocytes
2. Which of the options below is a FALSE statement about the innate immune system?
A.) Innate immunity is primarily carried out by lymphocytes of the immune system
B.) Phagocytosis is an import part of this aspect of the immune system
C.) It lacks immunological memory
D.) It developed earlier in evolution than acquired responses
3. The removal of T cells that recognize the body's own antigens within the thymus is referred to as:
A.) Clonal selection
B.) Tolerance
C.) Hematopoiesis
D.) Antigen presentation
Explanation / Answer
Answer =
1. "Barrier defense" of the immune system refers to:
C.) Natural protection by skin and mucosal surfaces of the body
Explaination=The skin or epithelial surface serves as primary barrier to microbial entry into the body
skin peeling,skin drying & acidity all serves to dislodge or kill foreign pathogens
Orifices such as mouth & eyes are ,tears wash away microbes ,cilia in nasal passages & respiratory tract push mucus of the body
mucus secretion trap & rinse away pathogens
they contain microbicidal factors that prevent many infections
INCORRECT OPTIONS Are=
A.) Cytokine production by immune cells
B.) Phagocytosis of microbes by innate immune cells
D.) Antibody secretion by lymphocytes
All these are adaptive immune responses
Answer= 2]
Which of the options below is a FALSE statement about the innate immune system?
A.) Innate immunity is primarily carried out by lymphocytes of the immune system
Explaination = Innate immunity is primarily caused by physical barriers like skin & mucous membrane & chemical mediators such as complement,cytokine ,pattern recognition molecules
only adaptive immunity is carried out by lymphocytes or lymphocytes are responsible for adaptive immunity
INCORRECT OPTIONS ARE=
B.) Phagocytosis is an import part of this aspect of the immune system
C.) It lacks immunological memory
D.) It developed earlier in evolution than acquire
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