They start at the dendrite is the correct answer...
They cannot travel backwards
And they are found in both the autonomic AND the somatic nervous system
At room temperature and normal atmospheric pressure, covalent compounds may exist as a solid, a liquid, or a gas, whereas ionic compounds exist only as solids, Ionic compounds exist in stable crystalline structures. Therefore, they have higher melting and boiling points compared to covalent compounds.
The name of this compound is lithium fluoride.
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The two are blood and lymph