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ALL pre- and post-ganglionic parasympathetic nerve cells
PRE-ganglionic sympathetic nerve cells
POST-ganglionic sympathetic nerve cells to sweat glands ONLY
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∙ 12y ago
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Is acetylcholine the substance released by axonal endings of the somatic efferent fibers and by the parasympathetic nerve fiber endings?
Yes, it does. In contrast, the sympathetic nerves release adrenaline
Why does the heart pumps when the person is scared?
We have sympathetic and parasympathetic nerves. When we are fightened or scared, sympathetic nerves trigger impulse into the brain in order to release adrenaline. This adrenaline makes the heart beat faster because more oxygen is required. This helps us cope from stress.After a while parasympathetic nerves send impulse to reduce the release of adrenaline and the heart starts beating normally
What do nerves have to do with exocytosis?
Nerves nerve endings that release neurotransmitters (eg. Acetylcholine) that initiate action potential to the innervated organ causing dpolarization, etc. This can be released through exocytosis.
Which neuro transmitter released from ganglionic of the parasympathetic division?
Nor-adrenaline is secreted at post ganglionic sympathetic synapses. There is re-uptake of Nor-adrenaline by nerve ending and only partially destroyed there by the enzyme C.O.M.T. There is no enzyme like acetylcholinesterase present there as in post ganglionic parasympathetic synapse to destroy the acetylcholine.
What are some important neurotransmitters?
Acetylcholine, adrenaline, noradrenaline, serine GABA. dopamine etc.
Does parasympathetic nerves secrete norepinephrine?
No. They secrete acetylcholine only.
What neurotransmitter is found at the synapse between nerves and human skeletal muscle cells?
Acetylcholine is the neurotransmitter at the neuromuscular junction.
Is acetylcholine part of the nervous system?
Yes. It is a neurotransmitter used in the brain, the peripheral autonomic nerves, and the junction between nerves and muscles.
What crosses a synapse?
Answer is Neurotrasmitters. There are several hundred types of neurotransmitters in brain. Some of them are Dopamine,Serotonin,acetylcholine,Adrenaline, Nor-adrenaline, Histamine,pep-tide neurotransmitters, certain amine acids. So impulse of depolarization flows across the nerve fiber and there is closed space between junction of two nerves, where chemical substances flows across, carrying the impulses to next nerve. After impulse is given to the next nerve fiber by say acetylcholine, then it will be destroyed by the enzyme acetylcholinesterase. Nor-adrenaline is taken up back by the nerve fiber.
What stops the release of adrenaline?
Propanalol (Inderal) has been shown to stop the release of adrenaline. Google it.
Why is it important for the release of acetylcholine to stop and for enzymes to destroy any remaining acetylcholine in the neuromuscular junction?
it has caca
What are norepinephrine releasing fibers called?
Andrenergic fibers release Norepinephrine and Cholinergic fibers release Acetylcholine.
