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aev [14]
3 years ago
10

Under what conditions is an antigen called an allergen?

Biology
1 answer:
IRINA_888 [86]3 years ago
6 0
When it triggers an abnormal or vigorous immune responce, treating the antigen that would normally cause no threat as something harmful.
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Answer:

Nervous system: This systems helps the five sense organs (eyes, ears, nose, tongue, skin) which all contain nerves that send messages to the brain about what is happening. The brain produces a response which it sends via other nerves to the muscles.

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