The receptors on the target sites of ANS are named cholinergic and adrenergic, corresponding to the neurotransmitters involved: acetylcholine and noradrenaline.
A. Cholinergic Receptors
| Receptor Type | Subtype | Target/Location |
| Muscarinic (M) | M1 | Stomach (neurons of parietal cells; HCl secretion) |
| | M2 | Heart |
| | M3 | Smooth muscle (GI, bronchi, and genito-urinary tract); Smooth muscle of blood vessels and exocrine glands |
| Nicotinic (N) | Nn (or N-I) | Autonomic ganglia |
| | Nm (or N-II) | Skeletal muscle (Motor end-plate) |
B. Adrenergic Receptors
| Receptor Type | Subtype | Target/Location |
| Alpha | Α1 | Smooth muscle (GI, bronchi, and genito-urinary tract); Smooth muscle of most blood vessels |
| | A2 | CNS (vasomotor center), presynaptic, negative feed-back |
| Beta | ß1 | Heart |
| | ß2 | Some blood vessels (skeletal muscle), bronchi, and uterus |
