In allergy and urticaria,the local arterioles | vedclass

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(D) During an allergic reaction,mast cells are activated and release chemical mediators into the surrounding tissues.One of the primary chemicals rele

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Histamine

Vedclass · Answer

(D) During an allergic reaction,mast cells are activated and release chemical mediators into the surrounding tissues.One of the primary chemicals released by mast cells is $Histamine$.$Histamine$ acts as a potent vasodilator,meaning it causes the local arterioles (small blood vessels) to dilate (widen).This dilation increases blood flow to the affected area,which contributes to the redness,swelling,and itching associated with allergic reactions like urticaria (hives).

In allergy and urticaria,the local arterioles dilate due to an increased substance released from mast cells,called:

Similar Questions

During an allergic condition,which hormone is secreted?

Assertion : Mast cells in the human body release excessive amounts of inflammatory chemicals,which cause allergic reactions.
Reason : Allergens in the environment on reaching human body stimulate mast cells in certain individuals.

Which type of antibody is produced in response to allergens?

Which chemicals are responsible for allergies?

Which of the following drugs can be used to quickly reduce the symptoms of allergy?

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