Multiple Choice
Which of the following may be signs of choking?
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21. The Immune System
Introduction to First-Line Defenses
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Which of the following is not a portal of entry for pathogens into the human body?
A
Digestive tract
B
Respiratory tract
C
Lymphatic system
D
Skin
Verified step by step guidance1
Understand the concept of 'portals of entry' which are pathways through which pathogens can enter the human body.
Identify the common portals of entry: the digestive tract, respiratory tract, and skin are all known pathways for pathogens.
Recognize that the lymphatic system is primarily involved in the immune response and circulation of lymph, not as a direct entry point for pathogens.
Consider the function of the lymphatic system, which includes filtering lymph and housing immune cells, rather than serving as an entry point.
Conclude that the lymphatic system is not a portal of entry for pathogens, unlike the digestive tract, respiratory tract, and skin.
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