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Nitroglycerin is used as a treatment for heart disease. How does it work?
AIt directly blocks calcium channels in cardiac muscle
BIt releases nitric oxide, which dilates vessels and restores blood flow
CIt binds surface receptors to trigger a phosphorylation cascade
DIt stimulates the adrenal gland to release adrenaline
Answer & Solution
Correct answer: B. It releases nitric oxide, which dilates vessels and restores blood flow
1. Nitroglycerin is described as a treatment for heart disease.
2. It acts by triggering the release of nitric oxide.
3. Nitric oxide causes blood vessels to dilate, restoring blood flow to the heart.
4. Blocking calcium channels or stimulating the adrenal gland are not the mechanism described for nitroglycerin.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 9 "Cell Communication", section Signaling Molecules_
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