Final answer:
The correct answer is option a. An IgE-mediated response to antigens is a type of allergic reaction that occurs within minutes upon exposure to a usually harmless antigen. The immune response involves the production of IgE antibodies and the binding of these antibodies to mast cells. The answer choice that is NOT consistent with an IgE-mediated response to antigens is profound vasoconstriction.
Step-by-step explanation:
An IgE-mediated response to antigens is a type of allergic reaction that occurs within minutes upon exposure to a usually harmless antigen. The immune response involves the production of IgE antibodies and the binding of these antibodies to mast cells.
Upon subsequent exposure to the same allergen, the IgE molecules on mast cells bind the antigen and stimulate the release of histamine and other chemical mediators, leading to allergic symptoms. Therefore, the answer choice that is NOT consistent with an IgE-mediated response to antigens is A. Profound vasoconstriction.