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Receptors and Neurotransmitters Use the following terms to fill in the blanks in the paragraphs below (terms may be used more than once): Beta Dopamine Epinephrine Norepinephrine Alpha Muscarinic Acetlycholine Nicotinic The existence of many types of neurotransmitters, the varied receptors available for individual neurotransmitters, and different types of target cells bearing these receptors enables neurotransmitters to induce a range of physiologic responses. The preganglionic fibers of the sympathetic and parasympathetic divisions of the autonomic nervous system (ANS) and a majority of the postganglionic fibers locate in the parasympathetic nervous system secrete the neurotransmitter Acetlycholine . This neurotransmitter is involved in the control of skeletal muscle action in the central nervous system (CNS) and the peripheral nervous system (PNS), stimulating skeletal muscle contraction at neuromuscular junctions. It can excite or inhibit ANS synapses. Most of the postganglionic fibers of the sympathetic division of the autonomic nervous system secrete the neurotransmitter Dopamine . In the CNS, this neurotransmitter creates a sense of feeling good, but in low doses it can cause feelings of depression. Depending on the receptor located in the PNS, this neurotransmitter can inhibit or excite ANS actions. Acetylcholine can combine with two different types of cholinergic receptors. The first type is located in the membranes of effector cells at the ends of all postganglionic parasympathetic nerve fibers and at the ends of cholinergic sympathetic nerve fibers. These receptors are called Nicotinic receptors, and they produce an excitatory response that is relatively slow. Muscarinic receptors are located in the synapses between the preganglionic and postganglionic neurons of the parasympathetic and sympathetic pathways and produce and excitatory response that is rapid. The two major chemical mediators (hormones) of the sympathetic nervous system, both of which are released by the adrenal glands, are Epinephrine and Norepinephrine . Alpha receptors are one of the two major receptors of the sympathetic nervous system and cause relaxation of uterine smooth muscle, relaxation of bronchiole smooth muscles, and increased inotropy and chronotropy in the heart when stimulated. Dopamine receptors are located in the brain. When stimulated, they create a sense of feeling good. Ad efficiency of the neurotransmitters that stimulate the previously mentioned receptors s associated with Parkinson’s’ disease. Paramedics use a synthetic version of this neurotransmitter to treat patients who are suffering from cardiogenic shock.