| Vasodilator systems |
| Adenosine |
| Adrenomedullin |
| Atrial natriuretic peptide (ANP) |
| Bradykinin |
| Brain natriuretic peptide (BNP) |
| Calcitonin gene-related peptide (CGRP) |
| Carbon monoxide (CO) |
| Endocannabinoids |
| Endothelin-3 (ET-3) |
| Endotoxin |
| Enkephalins |
| Glucagon |
| Histamine |
| Hydrogen sulphide |
| Interleukins |
| Natriuretic peptide of type C (CNP) |
| Nitric oxide (NO) |
| Prostacyclin (PGI2) |
| Substance P |
| Tumour necrosis factor-α (TNF-α) |
| Vasoactive intestinal polypeptide (VIP) |
| Vasoconstrictor systems |
| Angiotensin II |
| Adrenaline and noradrenaline |
| Sympathetic nervous system (SNS) |
| Endothelin-1 (ET-1) |
| Neuropeptide Y |
| Renin–angiotensin–aldosterone system (RAAS)/ |
| Vasopressin (ADH) |