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Question
Assertion :Mast cells in the human body release excessive amount of inflammatory chemicals, which cause allergic reactions. Reason: Allergens in the environment on reaching human body stimulate mast cells in certain individuals.
Assertion :Mast cells in the human body release excessive amount of inflammatory chemicals, which cause allergic reactions. Reason: Allergens in the environment on reaching human body stimulate mast cells in certain individuals.
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Solution
The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
The symptoms of an allergic reaction develop in response to histamine. Mast cells release a large amount of histamine into the bloodstream and it also act as initiator of the inflammatory response, which aids the arrival of leucocytes at a site of infection. Histamine stimulates capillary dilation, increased capillary permeability, closure of bronchial tubes, mucus secretion, pain and swelling. Hence, both Assertion and Reason are true and Reason is the correct explanation of Assertion.
The symptoms of an allergic reaction develop in response to histamine. Mast cells release a large amount of histamine into the bloodstream and it also act as initiator of the inflammatory response, which aids the arrival of leucocytes at a site of infection. Histamine stimulates capillary dilation, increased capillary permeability, closure of bronchial tubes, mucus secretion, pain and swelling. Hence, both Assertion and Reason are true and Reason is the correct explanation of Assertion.
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