Moderate

In the physiological system, nitric oxide is known to act through_______________?

Correct answer: C. Cyclic GMP

  • A. Cyclic AMP
  • B. Calcium ions
  • C. Cyclic GMP
  • D. Prostacyclins

Explanation

Nitric oxide activates soluble guanylyl cyclase, increasing cyclic GMP, which mediates effects such as vascular smooth-muscle relaxation. Cyclic AMP is used by several other hormone-signalling pathways.

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