Nitrite is a positive modulator of the Frank-Starling response in the vertebrate heart.

@article{Angelone2012NitriteIA,
  title={Nitrite is a positive modulator of the Frank-Starling response in the vertebrate heart.},
  author={Tommaso Angelone and Alfonsina Gattuso and Sandra Imbrogno and Rosa Mazza and Bruno Tota},
  journal={American journal of physiology. Regulatory, integrative and comparative physiology},
  year={2012},
  volume={302 11},
  pages={
          R1271-81
        },
  url={https://api.semanticscholar.org/CorpusID:16987587}
}
The results suggest that nitrite acts as a physiological source of NO, modulating through different species-specific mechanisms, the stretch-induced intrinsic regulation of the vertebrate heart.

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