Glucagon.
D002395:Catecholamines / Q000502:physiology; D005215:Fasting; D005934:Glucagon / Q000378:metabolism / Q000502:physiology; D006801:Humans; D007328:Insulin / Q000502:physiology; D007515:Islets of Langerhans / Q000294:innervation / Q000378:metabolism; D005082:Physical Exertion; D013564:Sympathetic Nervous System / Q000378:metabolism
D002395:Catecholamines; D007328:Insulin; D005934:Glucagon