Question

The passage states all of the following about allergies except?

1) Allergies are a hypersensitivity to substances that are essentially harmless.
2) The immune system malfunctions and produces antibodies to fight these substances.
3) The overabundance of histamine causes allergic symptoms such as headaches, rashes, and sneezing.
4) Allergies are caused by a lack of histamine in the bloodstream.

Answer 1

The incorrect statement about allergies is that they are caused by a lack of histamine in the bloodstream; in reality, allergies are due to an overreaction of the immune system resulting in the release of histamine.

Step-by-step explanation:

The statement from the passage that is incorrect about allergies is "4) Allergies are caused by a lack of histamine in the bloodstream." Allergies are indeed a hypersensitivity to substances that are essentially harmless, the immune system malfunctions and produces antibodies to fight these substances, and the overabundance of histamine causes allergic symptoms such as headaches, rashes, and sneezing. However, allergies are not caused by a lack of histamine. In fact, when an allergen enters the body, the immune system overreacts and releases histamine and other chemicals, which lead to allergy symptoms.