The United States Navy has twenty six grades of enlisted sailors and officers, with most sailors enlisting at the entry-level rank of Seaman Recruit (SR, paygrade E-1). The highest rank achievable in the Navy is Fleet Admiral.
Photo by: Sebastian Kaulitzki. The neuron (nerve cell) is the fundamental unit of the nervous system. The basic purpose of a neuron is to receive incoming information and, based upon that information, send a signal to other neurons, muscles, or glands. Neurons are designed to rapidly send signals across physiologically long distances. They do this using electrical signals called nerve impulses or action potentials. When a nerve impulse reaches the end of a neuron, it triggers the release of a chemical, or neurotransmitter. The neurotransmitter travels rapidly across the short gap between cells (the synapse) and acts to signal the adjacent cell.
&nbsp When trying to understand how neurotransmitters work, think of the sending of a message from the terminal buttons of one neuron and the reception of the message in the dendrite of another. The neuron that is sending the message from its terminal buttons is called the presynaptic neuron.hen this electrical impulse, called an action potential, is produced in the postsynaptic neuron, it will travel through the neuron (its axon, cell body, and dendrite) and begin the whole process of neurotransmission again.