The NMDA receptor is one of three types of ionotropic glutamate receptors. Nicotine also counteracts anticholinergics by activating nicotinic acetylcholine receptors. These increase serotonin levels through inhibition of serotonin reuptake receptors. Its pharmacological effects are due to binding to muscarinic acetylcholine receptors. BZ is an antagonist of muscarinic acetylcholine receptors. Budesonide is an agonist of glucocorticoid receptors. Dynorphin may play a role in the inhibition of dopamine release via kappa opioid receptors. Endocannabinoids are substances produced from within the body that activate cannabinoid receptors. Cadherins behave as both receptors and ligands for other molecules. Fc binds to various cell receptors and complement proteins. Its actions are mediated by specific oxytocin receptors. Epinephrine acts by binding to a variety of adrenergic receptors. Adrenaline acts by binding to a variety of adrenergic receptors. Typical or classical deliriants are those which block the muscarinic acetylcholine receptors (antagonism). Phytoestrogens exert their effects primarily through binding to estrogen receptors (ER).