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The development of Viagra is related to the discovery of nitric oxide as a ____________________

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The development of Viagra is related to the discovery of nitric oxide as a ____________________

(a) secondary messenger

(b) gaseous compound

(c) primary messenger

(d) cyclin inhibitor

I got this question in an interview for internship.

My question is based upon Cell Signaling and Signal Transduction in division Cell Signaling and Signal Transduction of Cell Biology

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Correct choice is (a) secondary messenger

To explain: The development of Viagra (sildenafil) is based on the discovery of nitric oxide as a secondary messenger. During sexual arousal, the nerve endings of penis release NO which causes relaxation of smooth muscle cells in lining of penile blood vessels and engorgement of penis with blood.

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