[Campbell Biology P.1020] What is the primary mechanism by which an injection of epinephrine ... | Practice Question

What is the primary mechanism by which an injection of epinephrine helps a person experiencing anaphylactic shock, according to the provided text?

  • A: It blocks receptors for histamine, diminishing allergy symptoms.
  • B: It constricts peripheral blood vessels and relaxes muscles in the lungs to help breathing.
  • C: It enhances the body's self-tolerance, preventing immune attack on its own molecules.
  • D: It stimulates the production of specific antibodies to neutralize allergens.

Explanation

The text states: 'An injection of epinephrine rapidly counteracts this allergic response, constricting peripheral blood vessels, reducing swelling in the throat, and relaxing muscles in the lungs to help breathing.'