Question

question 29 (2 points)
listen
our third line of immune defenses differ in what way(s) from our other forms of immunity?
immunity is raised against a single type of immune threat, and must be acquired through experience/exposure
they act only on the body surface, and are present from birth
they generally fail to protect us if our first and second lines of defense have also failed
they function through the action of complement proteins within the blood
they cannot protect us against infected or damaged self - cells
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Explanation:

The third - line of immune defense is the adaptive immune system. It is specific to a single type of threat (antigen - specific) and is acquired through exposure to pathogens. The first line includes physical barriers like skin and mucous membranes which are present from birth and act on body surfaces. The second - line is the innate immune response which includes complement proteins and other non - specific defenses. The third line can protect against infected or damaged self - cells. If first and second lines fail, the third line can still mount a response.

Answer:

Immunity is raised against a single type of immune threat, and must be acquired through experience/exposure