Iowa State University Extension & Outreach: Chickasaw County. Get inside Extension and discover how we support healthy people, healthy environments, and healthy economies. Read about some of the ways ISU Extension meets local needs, improves quality of life, and helps make our county a better place to live. Youâll be amazed at what we do.
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.
Neuron to Neuron. Each nerve cell in the brain sends and receives messages in the form of electrical and chemical signals. Once a cell receives and processes a message, it sends it on to other neurons. Neurotransmitters - The Brain's Chemical Messengers.