Question

indicate whether the following responses are a first, second, or third line of immune defense.
note: labels may be used more than once.
first second third *
skin
inflammation
chemical secretions from the sweat and sebum
memory b cells

Explanation:

• Skin is a physical barrier, part of the first line of defense.
• Inflammation is a non-specific response, part of the second line.
• Sweat/sebum chemicals (e.g., acids) are physical/chemical barriers, first line.
• Memory B cells are specific adaptive immune cells, third line.

Answer:

skin: first
inflammation: second
chemical secretions from the sweat and sebum: first
memory B cells: third