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UPSC 2024: Which one of the following is synthesised in human body that dilates blood vessels and increases blood flow?
(a)Nitric oxide
(b)Nitrous oxide
(c)Nitrogen dioxide
(d)Nitrogen pentoxide
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Not attemptedCorrect Answer: (a) Nitric oxide
Nitric oxide (NO) is synthesized in the body by nitric-oxide-synthase enzymes and acts on vascular smooth muscle via the cGMP pathway to cause vasodilation and increased blood flow; the other listed nitrogen oxides are not produced endogenously for this purpose. ([pmc.ncbi.nlm.nih.gov](https://pmc.ncbi.nlm.nih.gov/articles/PMC11058123/?utm_source=openai))
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Frequently Asked Questions
What is the correct answer to this UPSC 2024 Science & Technology question?▼
The correct answer is option (a): Nitric oxide. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
Which year was this Biology question asked in UPSC Prelims?▼
This question was asked in UPSC CSE Prelims 2024, GS Paper 1, as Question 33. It falls under Science & Technology > Biology.
What is the difficulty level of this UPSC question?▼
This question is rated "easy". It tests basic recall and most well-prepared aspirants should answer it correctly.
How many UPSC Prelims questions have been asked from Biology?▼
UPSC has asked 97 questions from Biology (under Science & Technology) across multiple years. Visit the topic page to see the full list and year-wise trends.