Sympathetic nervous system activity, which also controls blood pressure, acting through the beta adrenergic receptors.
Betaxolol also shows greater affininty for beta receptors than metoprolol.
Esmolol is a beta 1-selective (cardioselective) adrenergic receptor blocking agent.
In addition, alpha receptors respond differently to these packages than do beta receptors.
Indeed, the beta receptor was first detected serendipitously, during a search for more "masculine" quarry.
As studies of female rats have revealed, the beta receptor abounds in the urogenital tract.
So cells with defective beta 3 adrenergic receptors might, in theory, burn calories too slowly.
The diabetes connection arises because only a certain group of fat cells have the beta 3 receptor.
The sympathetic nervous system via noradrenaline acting on the beta receptors causes bronchodilation.
Most agonists of the beta receptors are selective for one or more beta-adrenoreceptors.