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.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

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Assertion is correct but Reason is incorrect.

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Both Assertion and Reason are incorrect.

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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.

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Similar questions

Q. Regarding the assertion and reason, choose the correct option.
Assertion [A]: Mast cells release excessive amounts of inflammatory chemicals which cause allergic reactions.
Reason [R]: Allergens in the environment on reaching human body stimulate mast cells in certain individuals.

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

Q. 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.

Q. Assertion :Mast cells in human body release excessive amount of inflammatory chemicals, which cause allergic reactions. Reason: Allergen present in environment on reaching human body stimulate mast cells in certain individuals.

Assertion (A) Order of the reaction can be zero or fractional.

Reason (R) We cannot determine order from balanced chemical equation.

(a) Both assertion and reason are correct and the reason is correct explanation of assertion
(b) Both assertion and reason are correct, but reason does not explain assertion.
(c) Assertion is correct, but reason is incorrect
(d) Both assertion and reason are incorrect
(e) Assertion is incorrect but reason is correct.

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