Multiple Choice
The second line of defense in innate immunity does not include which of the following?
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21. The Immune System
Introduction to Innate Immunity
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Which of the following are the most common portals of entry used by pathogens to enter the host?
A
Skin and mucous membranes
B
Lymph nodes and spleen
C
Bone marrow and thymus
D
Blood vessels and nerves
Verified step by step guidance1
Understand the concept of 'portals of entry' which refers to the pathways through which pathogens enter the body to cause infection.
Recognize that the skin and mucous membranes are the body's first line of defense and are common entry points for pathogens due to their exposure to the external environment.
Consider the role of lymph nodes and spleen, which are part of the immune system but not typically entry points for pathogens.
Evaluate the function of bone marrow and thymus, which are involved in the production and maturation of immune cells, not as entry points for pathogens.
Analyze the role of blood vessels and nerves, which are pathways within the body but not primary entry points for external pathogens.
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