Question

Histamine release leads to which of the following? (Select all that apply.)

a. Bronchial smooth muscle contraction
b. Bronchoconstriction
c. Decreased vascular permeability
d. Vasoconstriction
e. Edema

Answer 1

Histamine release leads to bronchial smooth muscle contraction (option a) and bronchoconstriction (option b) , as well as vasodilation (option d) and increased vascular permeability which causes edema (option e) .

Step-by-step explanation:

Histamine release during an allergic reaction leads to a cascade of symptoms due to its interaction with the body's systems. When histamine is released, it typically causes the following effects:

• Bronchial smooth muscle contraction, which can lead to bronchoconstriction and difficulty in breathing.
  
  
• Vasodilation and increased vascular permeability, allowing fluid to escape from the blood vessels into the surrounding tissue, leading to edema or swelling.

Contrary to causing vasoconstriction, histamine actually leads to vasodilation, which increases blood flow and can contribute to the redness and heat associated with inflammation.