| Effector organ | Sympathetic | Receptor | Parasympathetic |
| Heart S A node | Increased in heart rate | b1 | Decrease in heart rate |
| Atria | Increase contractility and conduction velocity | b1 | ¯ contractility & conduction velocity |
| AV node and Conduction system | conduction velocity | b1 | ¯ conduction velocity |
| Ventricles | contractility & conduction velocity | b2 | — |
| ArteriolesCoronary, skeletal, Pulmonary, renal, Abdominal & skin | VasoconstrictionDilatation | ab2 | Dilatation |
| Systemic veins | Constriction or Dilatation | a / b2 | — |
| Respiratory tractBronchial muscles | Relaxation | b2 | Contraction |
| Bronchial glands | Inhibition? | | Stimulation |
| Smooth musclesG. I. Tract | Decreased motilitySphincter constrictionInhibits secretion? | a, b2a | Increased motilitySphincter relaxationStimulates secretion |
| Gall Bladder | Relaxation | | Contraction |
| Urinary bladderMuscleSphincter | RelaxationContraction | ba | ConstrictionRelaxation |
| Ureters | Increase motility | a | Increase? |
| Uterus | Variable Contraction | a, b2 | Variable |
| Male Sex organs | Ejaculation | a | Erection |
| Sweat glands | Localised secretion | | Generalised secretion |
| SecretionsSalivary | VasoconstrictionThick, viscous secretion | a | Copious and watery |
| Pancreatic | Decreased secretion¯ insulin & glucagon secretion | ab | Increased secretioninsulin & glucagon Secretion |
| Gastric | viscous secretion | | secretion |
| Juxtaglomerular cells | Increased renin secretion | b | — |
| Pineal gland | Increased melatonin secretion | b | — |
| Milk letdown | Inhibition | | — |
| Ciliary muscle | Relaxation (far vision) | b | Constriction (near vision) |
| Pupillary muscle | Dilatation (dim light) | | Constriction (bright light) |
| BMR | Increased | | — |
