<prompt> Nitric oxide acts by:cGMPcAMPCalciumKinase  <response>: Ans: A cGMP Ref: Harpers Illustrated biochemistry, 28th edition.Explanation:Classification of Hormones by Mechanism of ActionI. Hormones that hind to intracellular receptors Androgens Calcitriol 1.252-D3 Estrogens Glucocorticoids Mineralocorticoids Progestins Retinoic acid Thyroid hormones T3 and T4II. Hormones that bifid to cell surface receptorsA. The second messenger is cAMP Alpha2 -Adrenergic catecholamines Alpha-Adrenergic catecholamines Adrenocorticotropic hormone Antidiuretic hormone Calcitonin Chorionic gonadotropin, human Corticotropin-releasing hormone Follicle-stimulating hormone Glucagon Lipotropin Luteinizing hormone Melanocyte-stimulating hormone Parathyroid hormone Somatostatin Thyroid-stimulating hormoneB. The second messenger is cGMP Atrial natriuretic factor Nitric oxide EDRFC. The second messenger is calcium or phosphatidvlinositols or both Acetylcholine muscarinic Alpha1 -Adrenergic catecholamines Angiotensin II Antidiuretic hormone vasopressin Cholecystokinin Gastrin Gonadotropin-releasing hormone Oxytocin Platelet-derived growth factor Substance P Thyrotropin-releasing hormoneD. The second messenger is a kinase or phosphatase cascade Adiponectin Chorionic somatomammotropin Epidermal growth factor Erythropoietin Fibroblast growth factor Growth hormone Insulin Insulin-like growth factors I and II Leptin Nerve growth factor Platelet-derived growth factor Prolactin 