Malaco Pastellfiskar (Swedish Fish) A favorite candy in the United States are the Swedish Fish. Today theyâre made by Cadbury Adams in Canada. Though they come in multiple flavors, the favorite is the red lingonberry flavored fish with the word Swedish embossed on the side.
The reason that opiates such as heroin and morphine affect us so powerfully is that these exogenous substances bind to the same receptors as our endogenous opioids. There are three kinds of receptors widely distributed throughout the brain: mu, delta, and kappa receptors.ut not all drugs increase dopamine levels in the brain in the same way. 1  Some substances imitate natural neuromediators and take their place on their receptors. 2  Other substances increase the secretion of natural neuromediators. 3  Still other substances block a natural neuromediator.
Similarly, certain neurotransmitters stimulate muscle cells at a neuromuscular junction, and some stimulate glandular secretions. Examples of neurotransmitters include acetylcholine, dopamine, serotonin, and nitric oxide.