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Each axon terminal contains thousands of membrane-bound sacs called vesicles, which in turn contain thousands of neurotransmitter molecules each. Neurotransmitters are chemical messengers which relay, amplify and modulate signals between neurons and other cells.
Cell signaling occurs by 2 methods, electrical and chemical signals. Cells receive information from their environment, usually in the form of electrical and chemical signals. So Cell signaling is a way for a cell to receive information from it environment.embrane receptors allow cells to recognize, transmit, and respond to a variety of specific signals. A technical definition I found is: Cell Signaling-all living cells sense and respond to their enviroment by a set of mechanisms known as cell signaling.