4. How many characteristics of antihistamines are covered in NCERT Class 12 chapter 16 notes?
Answer (1)
Ans- As given in NCERT notes for Class 12 chemistry chapter 16, the characteristics of histamines are:
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potent vasodilator
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contracts the smooth muscles in the bronchi & gut
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relaxes other muscles
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responsible for the nasal congestion
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responsible for an allergic response to pollen.
Antihistamines interfere with the natural action of histamine. They do so by competing with histamine for binding sites of the receptor protein.
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